[clang] [PAC] Implement function pointer re-signing (PR #98847)

[Daniil Kovalev via cfe-commits]

================
@@ -190,8 +190,8 @@ class CGBuilderTy : public CGBuilderBaseTy {
                               const llvm::Twine &Name = "") {
     if (!Addr.hasOffset())
       return Address(CreateAddrSpaceCast(Addr.getBasePointer(), Ty, Name),
-                     ElementTy, Addr.getAlignment(), nullptr,
-                     Addr.isKnownNonNull());
+                     ElementTy, Addr.getAlignment(), Addr.getPointerAuthInfo(),
+                     nullptr, Addr.isKnownNonNull());
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kovdan01 wrote:

Nit
```suggestion
                     /*Offset=*/nullptr, Addr.isKnownNonNull());
```

https://github.com/llvm/llvm-project/pull/98847