[llvm] InferAddressSpaces: Handle llvm.is.constant (PR #102010)

[Matt Arsenault via llvm-commits]

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@@ -429,6 +430,15 @@ void InferAddressSpacesImpl::collectRewritableIntrinsicOperands(
     appendsFlatAddressExpressionToPostorderStack(II->getArgOperand(0),
                                                  PostorderStack, Visited);
     break;
+  case Intrinsic::is_constant: {
+    Value *Ptr = II->getArgOperand(0);
+    if (Ptr->getType()->isPtrOrPtrVectorTy()) {
+      appendsFlatAddressExpressionToPostorderStack(Ptr, PostorderStack,
+                                                   Visited);
+    }
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arsenm wrote:

This rule is so open ended it's useless. If clang-format doesn't do this, it's not a rule. I'm not wasting more CI cycles to touch this 

https://github.com/llvm/llvm-project/pull/102010