4fabe6ffae
`__NoopCoro_ResumeDestroy` currently has private linkage, which causes [issues for Arm64EC](https://github.com/llvm/llvm-project/issues/158341). The Arm64EC lowering is trying to mangle and add thunks for `__NoopCoro_ResumeDestroy`, since it sees that it's address is taken (and, therefore, might be called from x64 code via a function pointer). MSVC's linker requires that the function be placed in COMDAT (`LNK1361: non COMDAT symbol '.L#__NoopCoro_ResumeDestroy' in hybrid binary`) which trips an assert in the verifier (`comdat global value has private linkage`) and the subsequent linking step fails since the private symbol isn't in the symbol table. Since there is no reason to use private linkage for `__NoopCoro_ResumeDestroy` and other coro related functions have also been [switched to internal linkage to improve debugging](https://github.com/llvm/llvm-project/pull/151224), this change switches to using internal linkage. Fixes #158341
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