[llvm] [MergeFunc] Preserve observable function pointer identity (PR #213604)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/include/llvm/Transforms/Utils/FunctionComparator.h llvm/lib/Transforms/Utils/FunctionComparator.cpp llvm/unittests/Transforms/Utils/FunctionComparatorTest.cpp --diff_from_common_commit
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/include/llvm/Transforms/Utils/FunctionComparator.h b/llvm/include/llvm/Transforms/Utils/FunctionComparator.h
index 0acf1e51d..7b2dcf98e 100644
--- a/llvm/include/llvm/Transforms/Utils/FunctionComparator.h
+++ b/llvm/include/llvm/Transforms/Utils/FunctionComparator.h
@@ -242,9 +242,9 @@ protected:
   ///          then left value is greater.
   ///          In another words, we compare serial numbers, for more details
   ///          see comments for sn_mapL and sn_mapR.
-  LLVM_ABI int cmpValues(
-      const Value *L, const Value *R,
-      ValueComparisonKind Kind = ValueComparisonKind::Normal) const;
+  LLVM_ABI int
+  cmpValues(const Value *L, const Value *R,
+            ValueComparisonKind Kind = ValueComparisonKind::Normal) const;
 
   /// Compare two Instructions for equivalence, similar to
   /// Instruction::isSameOperationAs.

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https://github.com/llvm/llvm-project/pull/213604