[llvm] [Clang] Prevent `mlink-builtin-bitcode` from internalizing the RPC client (PR #118661)

[Yaxun Liu via llvm-commits]

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@@ -233,6 +233,10 @@ bool InternalizePass::internalizeModule(Module &M) {
   else
     AlwaysPreserved.insert("__stack_chk_guard");
 
+  // Preserve the RPC interface for GPU host callbacks when internalizing.
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yxsamliu wrote:

Like the FIXME suggested, this might be done by introducing a lambda argument when creating this pass, like MustPreserveGV, or extend MustPreserveGV to be able to preserve functions. Then when AMDGPU backend creates this pass, it may put the name of the functions that needs preserving in that lamba.

However, since there is precedence to preserve specific functions by name, I won't put a hard requirement on this PR. It is up to you.

https://github.com/llvm/llvm-project/pull/118661