[InstCombine] add helper function for folding of icmp (and X, C2), C; NFC

llvm-svn: 279834
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineInternal.h b/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
index 32e0bdd..8619ac6 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
+++ b/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
@@ -579,6 +579,8 @@
                                    const APInt *C);
   Instruction *foldICmpAddConstant(ICmpInst &Cmp, BinaryOperator *Add,
                                    const APInt *C);
+  Instruction *foldICmpAndConstConst(ICmpInst &Cmp, BinaryOperator *And,
+                                     const APInt *C);
 
   Instruction *foldICmpEqualityWithConstant(ICmpInst &ICI);
   Instruction *foldICmpIntrinsicWithConstant(ICmpInst &ICI);