Reland "[ORC] Track __emutls_t definitions in IRMaterializationUnit" (#207161) (#208413) Relands #207161, which was reverted in #207775 after the new `clang/test/Interpreter/emulated-tls.cpp` failed on Darwin with `Symbols not found: [ ___emutls_get_address ]`. The `IRMaterializationUnit` fix and the test are unchanged from #207161. What the failure exposed is that thread_locals never worked in clang-repl on Darwin: `__emutls_get_address` is implemented in the compiler-rt builtins static archive, and nothing links it into the process, so process-symbol lookup cannot resolve it (on Linux it resolves from `libgcc_s.so`). New in this reland, per @lhames's suggestion (option 2) on the original PR: - `clang/lib/Interpreter/IncrementalExecutor.cpp`: on `__APPLE__`, reference `__emutls_get_address` (forcing the builtins archive member to be linked in) and define it as an absolute symbol in the process-symbols JITDylib, following the precedent of the MinGW `__main` workaround in `lli.cpp`. Scoped to the default in-process JITBuilder path only — the host address would be meaningless for an out-of-process executor, and custom-builder clients do their own setup. Verified on an aarch64-darwin machine: the previously failing test now passes, along with the rest of `clang/test/Interpreter`. @vgvassilev @lhames — could you take a look? 🤖 Done with the help of [Claude Code](https://claude.com/claude-code) (Claude Opus 4.8, human in the loop) Co-authored-by: Emery Conrad <emery.conrad@chicagotrading.com>
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