[clang] [CIR] Implement 'simple' atomic inc/dec. (PR #222730)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,cpp -- clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp clang/test/CIR/CodeGen/atomic.c --diff_from_common_commit
``````````

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The reproduction instructions above might return results for more than one PR
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp b/clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp
index 3a5e928c5..037c6411b 100644
--- a/clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp
@@ -681,8 +681,8 @@ public:
         return isPre ? emitIncOrDec(e, oldVal) : oldVal;
       }
 
-    // Special case for atomic increment/decrement on floats.
-    // Bail out non-power-of-2-sized floating point types (e.g., x86_fp80).
+      // Special case for atomic increment/decrement on floats.
+      // Bail out non-power-of-2-sized floating point types (e.g., x86_fp80).
       if (valType->isFloatingType()) {
         CIRGenFunction::CIRGenFPOptionsRAII FPOptsRAII(cgf, e);
         mlir::Type fpTy = cgf.convertType(valType);

``````````

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https://github.com/llvm/llvm-project/pull/222730