No longer OOM on invalid string length.

tools/lexer-shell.cc

Index: tools/lexer-shell.cc
diff --git a/tools/lexer-shell.cc b/tools/lexer-shell.cc
index 0610e7f70d22887114047fe32514c6038a22672e..7471db0e6aee28c970d4815ca8f099602373d497 100644
--- a/tools/lexer-shell.cc
+++ b/tools/lexer-shell.cc
@@ -104,6 +104,7 @@ class BaselineScanner {
             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;
@@ -111,6 +112,7 @@ class BaselineScanner {
       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;