[turbofan] Add Int32AddWithOverflow machine operator.

src/compiler/instruction.cc

 // Copyright 2014 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.
 
 #include "src/compiler/instruction.h"
 
 #include "src/compiler/common-operator.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 221 matching lines @@
     case kUnorderedNotEqual:
       return os << "unordered not equal";
     case kUnorderedLessThan:
       return os << "unordered less than";
     case kUnorderedGreaterThanOrEqual:
       return os << "unordered greater than or equal";
     case kUnorderedLessThanOrEqual:
       return os << "unordered less than or equal";
     case kUnorderedGreaterThan:
       return os << "unordered greater than";
+    case kOverflow:
+      return os << "overflow";
+    case kNotOverflow:
+      return os << "not overflow";
   }
   UNREACHABLE();
   return os;
 }
 
 
 OStream& operator<<(OStream& os, const Instruction& instr) {
   if (instr.OutputCount() > 1) os << "(";
   for (size_t i = 0; i < instr.OutputCount(); i++) {
     if (i > 0) os << ", ";
@@ skipping 218 matching lines @@
       os << " B" << (*iter)->id();
     }
     os << "\n";
   }
   return os;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8