[clang] Mark CXX module initializer with PACBTI attributes (PR #133716)

[Eli Friedman via cfe-commits]

================
@@ -793,6 +793,7 @@ void CodeGenModule::EmitCXXModuleInitFunc(Module *Primary) {
     }
     CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn, ModuleInits,
                                                      GuardAddr);
+    getTargetCodeGenInfo().setTargetAttributes(nullptr, Fn, *this);
----------------
efriedma-quic wrote:

This should be inside CreateGlobalInitOrCleanUpFunction .

It looks like for functions with internal linkage, it calls 
SetInternalFunctionAttributes which calls a bunch of stuff.  But we skip all of 
that for non-internal functions.  Which is probably wrong.

https://github.com/llvm/llvm-project/pull/133716
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