[CIR][NFC] Update existing atomic ops to match assembly conventions (#161543)

This patch updates the definitions of `cir.atomic.xchg` and
`cir.atomic.cmpxchg` to make them follow the established CIR assembly
conventions. Some other minor changes are also made along the way:

- The verifier for `cir.atomic.cmpxchg` is now fully declared in
TableGen.
- The `Op` suffix is appended to `CIR_AtomicXchg` and
`CIR_AtomicCmpXchg` to follow the naming conventions for TableGen
operation records.

1 files changed, 4 insertions, 4 deletions

diff --git a/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp b/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
index f0d73ac87238..3abba3d095f2 100644
--- a/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
+++ b/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
@@ -694,8 +694,8 @@ getLLVMMemOrder(std::optional<cir::MemOrder> memorder) {
   llvm_unreachable("unknown memory order");
 }
 
-mlir::LogicalResult CIRToLLVMAtomicCmpXchgLowering::matchAndRewrite(
-    cir::AtomicCmpXchg op, OpAdaptor adaptor,
+mlir::LogicalResult CIRToLLVMAtomicCmpXchgOpLowering::matchAndRewrite(
+    cir::AtomicCmpXchgOp op, OpAdaptor adaptor,
     mlir::ConversionPatternRewriter &rewriter) const {
   mlir::Value expected = adaptor.getExpected();
   mlir::Value desired = adaptor.getDesired();
@@ -719,8 +719,8 @@ mlir::LogicalResult CIRToLLVMAtomicCmpXchgLowering::matchAndRewrite(
   return mlir::success();
 }
 
-mlir::LogicalResult CIRToLLVMAtomicXchgLowering::matchAndRewrite(
-    cir::AtomicXchg op, OpAdaptor adaptor,
+mlir::LogicalResult CIRToLLVMAtomicXchgOpLowering::matchAndRewrite(
+    cir::AtomicXchgOp op, OpAdaptor adaptor,
     mlir::ConversionPatternRewriter &rewriter) const {
   assert(!cir::MissingFeatures::atomicSyncScopeID());
   mlir::LLVM::AtomicOrdering llvmOrder = getLLVMMemOrder(adaptor.getMemOrder());