[C++20] [Modules] Instantiate pending instantiations when GMF ends (#126842)

Close https://github.com/llvm/llvm-project/issues/125999

The cause of the problem is, when we instantiate the pending
instantiation, the owning module of the TU gets into 'foo' instead of
the GMF.

The concern of the patch is, I am not sure the point of 'pending'
instantiations. I mean, if there is a reason we **must** pending the
intantiations to the end of the TU.
2 files changed
tree: c2c01e9c4000382da09beab8460ac37212ffa6cf
  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. libunwind/
  16. lld/
  17. lldb/
  18. llvm/
  19. llvm-libgcc/
  20. mlir/
  21. offload/
  22. openmp/
  23. polly/
  24. pstl/
  25. runtimes/
  26. third-party/
  27. utils/
  28. .clang-format
  29. .clang-tidy
  30. .git-blame-ignore-revs
  31. .gitattributes
  32. .gitignore
  33. .mailmap
  34. CODE_OF_CONDUCT.md
  35. CONTRIBUTING.md
  36. LICENSE.TXT
  37. pyproject.toml
  38. README.md
  39. SECURITY.md
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