[clang] [CUDA][HIP] Exclude external variables from constant promotion. (PR #73549)

[Matt Arsenault via cfe-commits]

================
@@ -104,3 +106,14 @@ void fun() {
   (void) b<double>;
   (void) var_host_only;
 }
+
+extern __global__ void external_func();
+extern void* const external_dep[] = {
----------------
arsenm wrote:

Sounds broken that the behavior would differ between array and non-array ?

https://github.com/llvm/llvm-project/pull/73549