[clang-repl] Fix InstantiateTemplate & Value test while building against emscripten (#154513)

Building with assertions flag (-sAssertions=2) gives me these 

```
[ RUN ] InterpreterTest.InstantiateTemplate Aborted(Assertion failed: undefined symbol '__clang_Interpreter_SetValueWithAlloc'. perhaps a side module was not linked in? if this global was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment) Error in loading dynamic library incr_module_3.wasm: RuntimeError: Aborted(Assertion failed: undefined symbol '__clang_Interpreter_SetValueWithAlloc'. perhaps a side module was not linked in? if this global was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment) Could not load dynamic lib: incr_module_3.wasm RuntimeError: Aborted(Assertion failed: undefined symbol '__clang_Interpreter_SetValueWithAlloc'. perhaps a side module was not linked in? if this global was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment)
[ RUN ] InterpreterTest.InstantiateTemplate Aborted(Assertion failed: undefined symbol '__clang_Interpreter_SetValueNoAlloc'. perhaps a side module was not linked in? if this global was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment) Error in loading dynamic library incr_module_3.wasm: RuntimeError: Aborted(Assertion failed: undefined symbol '__clang_Interpreter_SetValueNoAlloc'. perhaps a side module was not linked in? if this global was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment) Could not load dynamic lib: incr_module_3.wasm RuntimeError: Aborted(Assertion failed: undefined symbol '__clang_Interpreter_SetValueNoAlloc'. perhaps a side module was not linked in? if this global was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment)
[ RUN ] InterpreterTest.InstantiateTemplate Aborted(Assertion failed: undefined symbol '_ZnwmPv26__clang_Interpreter_NewTag'. perhaps a side module was not linked in? if this global was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment) Error in loading dynamic library incr_module_23.wasm: RuntimeError: Aborted(Assertion failed: undefined symbol '_ZnwmPv26__clang_Interpreter_NewTag'. perhaps a side module was not linked in? if this global was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment) Could not load dynamic lib: incr_module_23.wasm RuntimeError: Aborted(Assertion failed: undefined symbol '_ZnwmPv26__clang_Interpreter_NewTag'. perhaps a side module was not linked in? if this global was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment)
[ RUN ] InterpreterTest.Value Aborted(Assertion failed: undefined symbol '_Z9getGlobalv'. perhaps a side module was not linked in? if this global was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment) Error in loading dynamic library incr_module_36.wasm: RuntimeError: Aborted(Assertion failed: undefined symbol '_Z9getGlobalv'. perhaps a side module was not linked in? if this global was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment) Could not load dynamic lib: incr_module_36.wasm
[ RUN ] InterpreterTest.Value Aborted(Assertion failed: undefined symbol '_Z9getGlobalv'. perhaps a side module was not linked in? if this global was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment) Error in loading dynamic library incr_module_36.wasm: RuntimeError: Aborted(Assertion failed: undefined symbol '_Z9setGlobali'. perhaps a side module was not linked in? if this global was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment) Could not load dynamic lib: incr_module_36.wasm
```

**So we have some symbols missing here that are needed by the side
modules being created here.**

First 2 are needed by both tests 
Last 3 are needed for these lines accordingly in the Value test.


https://github.com/llvm/llvm-project/blob/dc23869f98452ca2c4086f12bb431a8d6fdb8169/clang/unittests/Interpreter/InterpreterTest.cpp#L355

https://github.com/llvm/llvm-project/blob/dc23869f98452ca2c4086f12bb431a8d6fdb8169/clang/unittests/Interpreter/InterpreterTest.cpp#L364

https://github.com/llvm/llvm-project/blob/dc23869f98452ca2c4086f12bb431a8d6fdb8169/clang/unittests/Interpreter/InterpreterTest.cpp#L365

Everything should work as expected after this 
```
[----------] 9 tests from InterpreterTest
[ RUN      ] InterpreterTest.Sanity
[       OK ] InterpreterTest.Sanity (18 ms)
[ RUN      ] InterpreterTest.IncrementalInputTopLevelDecls
[       OK ] InterpreterTest.IncrementalInputTopLevelDecls (45 ms)
[ RUN      ] InterpreterTest.Errors
[       OK ] InterpreterTest.Errors (29 ms)
[ RUN      ] InterpreterTest.DeclsAndStatements
[       OK ] InterpreterTest.DeclsAndStatements (34 ms)
[ RUN      ] InterpreterTest.UndoCommand
/Users/anutosh491/work/llvm-project/clang/unittests/Interpreter/InterpreterTest.cpp:156: Skipped
Test fails for Emscipten builds

[  SKIPPED ] InterpreterTest.UndoCommand (0 ms)
[ RUN      ] InterpreterTest.FindMangledNameSymbol
[       OK ] InterpreterTest.FindMangledNameSymbol (85 ms)
[ RUN      ] InterpreterTest.InstantiateTemplate
[       OK ] InterpreterTest.InstantiateTemplate (127 ms)
[ RUN      ] InterpreterTest.Value
[       OK ] InterpreterTest.Value (608 ms)
[ RUN      ] InterpreterTest.TranslationUnit_CanonicalDecl
[       OK ] InterpreterTest.TranslationUnit_CanonicalDecl (64 ms)
[----------] 9 tests from InterpreterTest (1014 ms total)
```

This is similar to how we need to take care of some symbols while
building side modules during running cppinterop's test suite !
2 files changed
tree: 5456d08e94d261509a4057da1580727d1bd39cad
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. flang-rt/
  11. libc/
  12. libclc/
  13. libcxx/
  14. libcxxabi/
  15. libsycl/
  16. libunwind/
  17. lld/
  18. lldb/
  19. llvm/
  20. llvm-libgcc/
  21. mlir/
  22. offload/
  23. openmp/
  24. orc-rt/
  25. polly/
  26. runtimes/
  27. third-party/
  28. utils/
  29. .clang-format
  30. .clang-format-ignore
  31. .clang-tidy
  32. .git-blame-ignore-revs
  33. .gitattributes
  34. .gitignore
  35. .mailmap
  36. CODE_OF_CONDUCT.md
  37. CONTRIBUTING.md
  38. LICENSE.TXT
  39. pyproject.toml
  40. README.md
  41. SECURITY.md
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