[clang] [CIR] Add atomic exchange operation (PR #158089)

[Bruno Cardoso Lopes via cfe-commits]

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@@ -2730,6 +2730,16 @@ mlir::LogicalResult cir::ThrowOp::verify() {
   return failure();
 }
 
+//===----------------------------------------------------------------------===//
+// AtomicXchg
+//===----------------------------------------------------------------------===//
+
+LogicalResult cir::AtomicXchg::verify() {
+  if (getPtr().getType().getPointee() != getVal().getType())
+    return emitOpError("ptr type and val type must match");
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bcardosolopes wrote:

Can't this be done with tablegen constraints? Please also add a test to cover this

https://github.com/llvm/llvm-project/pull/158089