[clang] [PAC] Add support for __ptrauth type qualifier (PR #100830)

[Daniil Kovalev via cfe-commits]

================
@@ -2190,6 +2198,15 @@ RValue CodeGenFunction::EmitLoadOfAnyValue(LValue LV, AggValueSlot Slot,
 /// method emits the address of the lvalue, then loads the result as an rvalue,
 /// returning the rvalue.
 RValue CodeGenFunction::EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
+  // Load from __ptrauth.
+  if (PointerAuthQualifier PtrAuth = LV.getQuals().getPointerAuth()) {
+    LV.getQuals().removePointerAuth();
+    auto value = EmitLoadOfLValue(LV, Loc).getScalarVal();
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kovdan01 wrote:

Nit

```suggestion
    auto Value = EmitLoadOfLValue(LV, Loc).getScalarVal();
```

https://github.com/llvm/llvm-project/pull/100830