[clang] [Clang] Fix crash with implicit int-to-pointer conversion (PR #114218)

[Eli Friedman via cfe-commits]

================
@@ -4928,8 +4928,9 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
     // Look at the argument type to determine whether this is a volatile
     // operation. The parameter type is always volatile.
     QualType PtrTy = E->getArg(0)->IgnoreImpCasts()->getType();
----------------
efriedma-quic wrote:

Related testcase: `void f() { volatile int x[10]; __atomic_test_and_set(x,0); }`.

https://github.com/llvm/llvm-project/pull/114218