[clang] [clang] Add builtin_get_vtable_pointer and virtual_member_address (PR #135469)

[Oliver Hunt via cfe-commits]

================
@@ -5349,6 +5350,40 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl 
GD, unsigned BuiltinID,
     return RValue::get(Result);
   }
 
+  case Builtin::BI__builtin_virtual_member_address: {
+    Address This = EmitLValue(E->getArg(0)).getAddress();
+    APValue ConstMemFun;
+    E->getArg(1)->isCXX11ConstantExpr(getContext(), &ConstMemFun, nullptr);
----------------
ojhunt wrote:

Yes, the isCXX11ConstantExpr gives us the target through ConstMemFun, but I'll 
see if there's a cleaner way to do this.

https://github.com/llvm/llvm-project/pull/135469
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