[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 309 matching lines @@
 #define RETURN_NAME(x) \
   case k##x:           \
     return true;
       CONTROL_OP_LIST(RETURN_NAME)
       COMMON_OP_LIST(RETURN_NAME)
 #undef RETURN_NAME
       default:
         return false;
     }
   }
+
+  static bool IsPhiOpcode(Value val) {
+    return val == kPhi || val == kEffectPhi;
+  }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPCODES_H_