No longer OOM on invalid string length.

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 9724ec74c59f008b65b99ab1fcca5bc0adeb28a4..9376428f0c24860ad5d1a7bbd73611b4536f8158 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -215,6 +215,7 @@ Handle<String> Parser::LookupCachedSymbol(int symbol_id) {
   Handle<String> result = symbol_cache_.at(symbol_id);
   if (result.is_null()) {
     result = scanner()->AllocateInternalizedString(isolate_);
+    ASSERT(!result.is_null());
     symbol_cache_.at(symbol_id) = result;
     return result;
   }
@@ -615,6 +616,7 @@ void ParserTraits::ReportMessageAt(Scanner::Location source_location,
   Handle<FixedArray> elements = factory->NewFixedArray(args.length());
   for (int i = 0; i < args.length(); i++) {
     Handle<String> arg_string = factory->NewStringFromUtf8(CStrVector(args[i]));
+    ASSERT(!arg_string.is_null());
     elements->set(i, *arg_string);
   }
   Handle<JSArray> array = factory->NewJSArrayWithElements(elements);
@@ -672,7 +674,10 @@ Handle<String> ParserTraits::GetSymbol(Scanner* scanner) {
       parser_->scanner()->LogSymbol(parser_->log_, parser_->position());
     }
   }
-  return parser_->scanner()->AllocateInternalizedString(parser_->isolate_);
+  Handle<String> result =
+      parser_->scanner()->AllocateInternalizedString(parser_->isolate_);
+  ASSERT(!result.is_null());
+  return result;
 }
 
 
@@ -1709,8 +1714,8 @@ void Parser::Declare(Declaration* declaration, bool resolve, bool* ok) {
         return;
       }
       Handle<String> message_string =
-          isolate()->factory()->NewStringFromUtf8(CStrVector("Variable"),
-                                                  TENURED);
+          isolate()->factory()->InternalizeOneByteString(
+              STATIC_ASCII_VECTOR("Variable"));
       Expression* expression =
           NewThrowTypeError(isolate()->factory()->redeclaration_string(),
                             message_string, name);
@@ -3815,6 +3820,7 @@ bool RegExpParser::simple() {
 RegExpTree* RegExpParser::ReportError(Vector<const char> message) {
   failed_ = true;
   *error_ = isolate()->factory()->NewStringFromAscii(message, NOT_TENURED);
+  ASSERT(!error_->is_null());
   // Zip to the end to make sure the no more input is read.
   current_ = kEndMarker;
   next_pos_ = in()->length();