[llvm] [BranchFolding] Add a hook to override tail merge size (PR #99025)

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git-clang-format --diff 5c8eb83ce8e4ef40fbd61a05f1de6394eb908da4 6c2c8fc42d4e540ece65af5cbe1f5ce6bb4f4f75 --extensions h,cpp -- llvm/include/llvm/CodeGen/TargetInstrInfo.h llvm/lib/CodeGen/BranchFolding.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/include/llvm/CodeGen/TargetInstrInfo.h b/llvm/include/llvm/CodeGen/TargetInstrInfo.h
index f0728cd4cc..d6a73d1644 100644
--- a/llvm/include/llvm/CodeGen/TargetInstrInfo.h
+++ b/llvm/include/llvm/CodeGen/TargetInstrInfo.h
@@ -2228,9 +2228,7 @@ public:
 
   /// Returns the target-specific default value for tail merging.
   /// This value will be used if the tail-merge-size argument is not provided.
-  virtual unsigned getTailMergeSize() const {
-    return 3;
-  }
+  virtual unsigned getTailMergeSize() const { return 3; }
 
   /// Returns the callee operand from the given \p MI.
   virtual const MachineOperand &getCalleeOperand(const MachineInstr &MI) const {

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https://github.com/llvm/llvm-project/pull/99025