[clang] [CIR] Avoid folding non-integer constants as integer casts (PR #214551)

[Kunal Dubey via cfe-commits]

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@@ -1013,10 +1013,15 @@ OpFoldResult cir::CastOp::fold(FoldAdaptor adaptor) {
 
       auto srcIntTy = mlir::cast<cir::IntType>(srcTy);
       auto dstIntTy = mlir::cast<cir::IntType>(getType());
+      auto constIntAttr = srcConst.getValueAttr<cir::IntAttr>();
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xakep8 wrote:

I've added the UndefAttr propogation similar to the Poison propogation PTAL.

https://github.com/llvm/llvm-project/pull/214551