[clang] [clang] ``noconvergent`` does not affect calls to convergent functions (PR #132701)

[Matt Arsenault via cfe-commits]

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@@ -1677,7 +1676,8 @@ being treated as convergent when it's safe.
 
   __device__ int example(void) {
     float x;
-    [[clang::noconvergent]] x = bar(x);
+    [[clang::noconvergent]] x = bar(x); // no effect on convergence
+    [[clang::noconvergent]] { asm volatile ("nop"); } // the asm call is non-convergent
   }
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arsenm wrote:

Maybe should have an example of an undefined usage 

https://github.com/llvm/llvm-project/pull/132701