[turbofan] First version of loop peeling.

src/compiler/opcodes.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_OPCODES_H_
 #define V8_COMPILER_OPCODES_H_
 
 // Opcodes for control operators.
 #define INNER_CONTROL_OP_LIST(V) \
   V(Dead)                        \
@@ skipping 276 matching lines @@
 
   // Returns true if opcode for JavaScript operator.
   static bool IsJsOpcode(Value value) {
     return kJSEqual <= value && value <= kJSDebugger;
   }
 
   // Returns true if opcode for leaf operator.
   static bool IsLeafOpcode(Value value) {
     return kInt32Constant <= value && value <= kHeapConstant;
   }
+
+  static bool IsPhiOpcode(Value val) {
+    return val == kPhi || val == kEffectPhi;
+  }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPCODES_H_