[clang] [Clang][ARM] Only try to redefine builtins for non-CUDA (PR #128222)

[Artem Belevich via cfe-commits]

================
@@ -27,6 +27,8 @@
 extern "C" {
 #endif
 
+#if !defined(__CUDA_ARCH__)
+
----------------
Artem-B wrote:

```
#if __CUDA_ARCH__
// Make sure the declarations here are in sync with the functions provided under #else.
<declarations>
#else
<existing code>
#endif
```


https://github.com/llvm/llvm-project/pull/128222