[clang] [CIR] Fix warnings related to unused variables in release builds (PR #151412)

[Andy Kaylor via cfe-commits]

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@@ -439,7 +439,7 @@ class ScalarExprEmitter : public 
StmtVisitor<ScalarExprEmitter, mlir::Value> {
       value = builder.getTrue(cgf.getLoc(e->getExprLoc()));
     } else if (type->isIntegerType()) {
       QualType promotedType;
-      bool canPerformLossyDemotionCheck = false;
+      [[maybe_unused]] bool canPerformLossyDemotionCheck = false;
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andykaylor wrote:

This is written to but never read. It will be read when sanitizer support is 
added.

https://github.com/llvm/llvm-project/pull/151412
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