[clang] [CIR][AMDGPU] Implement the clang::atomic statement attribute (PR #225364)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- clang/include/clang/CIR/MissingFeatures.h clang/lib/CIR/CodeGen/CIRGenAtomic.cpp clang/lib/CIR/CodeGen/CIRGenBuiltinAMDGPU.cpp clang/lib/CIR/CodeGen/CIRGenModule.cpp clang/lib/CIR/CodeGen/CIRGenModule.h clang/lib/CIR/CodeGen/CIRGenStmt.cpp clang/lib/CIR/Dialect/Transforms/TargetLowering/Targets/AMDGPU.cpp clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVMIR.cpp --diff_from_common_commit
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``````````diff
diff --git a/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVMIR.cpp b/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVMIR.cpp
index a55ed8a86..9fc12631d 100644
--- a/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVMIR.cpp
+++ b/clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVMIR.cpp
@@ -99,7 +99,7 @@ private:
       inst->setMetadata("srcloc", node);
     return mlir::success();
   }
-  
+
   /// Attach the AMDGPU atomic metadata that lets the backend select a native
   /// atomic instruction instead of expanding to a cmpxchg loop.
   void amendAMDGPUAtomicMetadata(

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https://github.com/llvm/llvm-project/pull/225364