[clang] [llvm] [ARM][AArch64] BTI, GCS, PAC Module flag update. (PR #86212)

[Andrew Savonichev via llvm-commits]

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@@ -7070,6 +7070,8 @@ Error BitcodeReader::materializeModule() {
 
   UpgradeARCRuntime(*TheModule);
 
+  CopyModuleAttrToFunctions(*TheModule);
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asavonic wrote:

I wonder if we need to do this here, or in [BitcodeReader::globalCleanup](https://github.com/llvm/llvm-project/blob/674491928c9ae8ec25bde79044894570988202ea/llvm/lib/Bitcode/Reader/BitcodeReader.cpp#L3973), where we upgrade function attributes.

https://github.com/llvm/llvm-project/pull/86212