[clang] [OpenACC][CIR] Implement atomic-write lowering (PR #164627)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/test/CIR/CodeGenOpenACC/atomic-write.cpp clang/include/clang/AST/StmtOpenACC.h clang/lib/AST/StmtOpenACC.cpp clang/lib/CIR/CodeGen/CIRGenStmtOpenACC.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/AST/StmtOpenACC.cpp b/clang/lib/AST/StmtOpenACC.cpp
index 53ab6e420..a4c6611c5 100644
--- a/clang/lib/AST/StmtOpenACC.cpp
+++ b/clang/lib/AST/StmtOpenACC.cpp
@@ -368,7 +368,8 @@ OpenACCAtomicConstruct::getAssociatedStmtInfo() const {
     // We want the L-value for ONLY the X side, so we ignore implicit casts. For
     // the right side (the expr), we emit it as an r-value so we need to
     // maintain implicit casts.
-    return {/*v=*/nullptr, BinaryArgs.first->IgnoreImpCasts(), BinaryArgs.second};
+    return {/*v=*/nullptr, BinaryArgs.first->IgnoreImpCasts(),
+            BinaryArgs.second};
   }
   }
 

``````````

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https://github.com/llvm/llvm-project/pull/164627