[clang] [clang][diagnostics] Refactor `warn_doc_function_method_decl_mismatch` to use enum_select (PR #181769)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- clang/include/clang/CIR/Dialect/IR/FPEnv.h clang/lib/CIR/Dialect/IR/FPEnv.cpp clang/include/clang/CIR/Dialect/Builder/CIRBaseBuilder.h clang/include/clang/CIR/MissingFeatures.h clang/lib/AST/CommentSema.cpp clang/lib/CIR/CodeGen/CIRGenBuilder.h clang/lib/CIR/CodeGen/CIRGenFunction.cpp clang/lib/CIR/CodeGen/CIRGenFunction.h --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/include/clang/CIR/MissingFeatures.h b/clang/include/clang/CIR/MissingFeatures.h
index 6c9864aab..59d0482d3 100644
--- a/clang/include/clang/CIR/MissingFeatures.h
+++ b/clang/include/clang/CIR/MissingFeatures.h
@@ -279,7 +279,7 @@ struct MissingFeatures {
   static bool emitNullabilityCheck() { return false; }
   static bool emitTypeCheck() { return false; }
   static bool emitTypeMetadataCodeForVCall() { return false; }
-  
+
   // Fast math.
   static bool fastMathGuard() { return false; }
   // Should be implemented with a moduleOp level attribute and directly
diff --git a/clang/lib/CIR/CodeGen/CIRGenFunction.cpp b/clang/lib/CIR/CodeGen/CIRGenFunction.cpp
index 07258c6a2..e8a17a2da 100644
--- a/clang/lib/CIR/CodeGen/CIRGenFunction.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenFunction.cpp
@@ -1154,7 +1154,7 @@ void CIRGenFunction::CIRGenFPOptionsRAII::ConstructorHelper(
   cgf.curFPFeatures = fpFeatures;
 
   oldExcept = cgf.builder.getDefaultConstrainedExcept();
-  oldRounding =cgf.builder.getDefaultConstrainedRounding();
+  oldRounding = cgf.builder.getDefaultConstrainedRounding();
 
   if (oldFPFeatures == fpFeatures)
     return;

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https://github.com/llvm/llvm-project/pull/181769