[clang] [llvm] Add __attribute__((visibility("default"))) attribute to certain symbols to stop them being hidden when linking clangInterpreter library to other libraries during Emscripten build (PR #146786)

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mcbarton wrote:

@vgvassilev Emscripten doesn't support linker scripts, and that is the platform that has the issue.

https://github.com/llvm/llvm-project/pull/146786