Inline memcpy for small constant sizes.

src/IceTargetLoweringX86Base.h

Index: src/IceTargetLoweringX86Base.h
diff --git a/src/IceTargetLoweringX86Base.h b/src/IceTargetLoweringX86Base.h
index 40966a2f6d0920c5266cc9703d97e3344c20f04c..00632d56f65d51a7e11353673219c6992c2651c9 100644
--- a/src/IceTargetLoweringX86Base.h
+++ b/src/IceTargetLoweringX86Base.h
@@ -154,7 +154,9 @@ protected:
                       Operand *Val);
   void lowerCountZeros(bool Cttz, Type Ty, Variable *Dest, Operand *FirstVal,
                        Operand *SecondVal);
-  /// Replace a function call with inline instructions.
+  /// Replace a call to memcpy with inline instructions.
+  void lowerMemcpy(Operand *Dest, Operand *Src, Operand *Count);
+  /// Replace a call to memset with inline instructions.
   void lowerMemset(Operand *Dest, Operand *Val, Operand *Count);
 
   /// Lower an indirect jump adding sandboxing when needed.