Reland "No longer OOM on invalid string length."

tools/lexer-shell.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 50 matching lines @@
     scanner_ = new Scanner(unicode_cache_);
     switch (encoding) {
       case UTF8:
         stream_ = new Utf8ToUtf16CharacterStream(source_, length);
         break;
       case UTF16: {
         Handle<String> result = isolate->factory()->NewStringFromTwoByte(
             Vector<const uint16_t>(
                 reinterpret_cast<const uint16_t*>(source_),
                 length / 2));
+        CHECK_NOT_EMPTY_HANDLE(isolate, result);
         stream_ =
             new GenericStringUtf16CharacterStream(result, 0, result->length());
         break;
       }
       case LATIN1: {
         Handle<String> result = isolate->factory()->NewStringFromOneByte(
             Vector<const uint8_t>(source_, length));
+        CHECK_NOT_EMPTY_HANDLE(isolate, result);
         stream_ =
             new GenericStringUtf16CharacterStream(result, 0, result->length());
         break;
       }
     }
     timer->Start();
     scanner_->Initialize(stream_);
   }
 
   ~BaselineScanner() {
@@ skipping 134 matching lines @@
                            repeat);
         baseline_total += time.InMillisecondsF();
       }
       if (benchmark.empty()) benchmark = "Baseline";
       printf("%s(RunTime): %.f ms\n", benchmark.c_str(), baseline_total);
     }
   }
   v8::V8::Dispose();
   return 0;
 }