[es6] Correct parsing of regular expression literal flags.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 18641c0ceb4e2d774884552428f21e2d97692ada..f074e89d476e348c5d226827bef35c359a4fe592 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -2297,7 +2297,7 @@ void Factory::SetRegExpAtomData(Handle<JSRegExp> regexp,
 
   store->set(JSRegExp::kTagIndex, Smi::FromInt(type));
   store->set(JSRegExp::kSourceIndex, *source);
-  store->set(JSRegExp::kFlagsIndex, Smi::FromInt(flags.value()));
+  store->set(JSRegExp::kFlagsIndex, Smi::FromInt(flags));
   store->set(JSRegExp::kAtomPatternIndex, *data);
   regexp->set_data(*store);
 }
@@ -2312,7 +2312,7 @@ void Factory::SetRegExpIrregexpData(Handle<JSRegExp> regexp,
   Smi* uninitialized = Smi::FromInt(JSRegExp::kUninitializedValue);
   store->set(JSRegExp::kTagIndex, Smi::FromInt(type));
   store->set(JSRegExp::kSourceIndex, *source);
-  store->set(JSRegExp::kFlagsIndex, Smi::FromInt(flags.value()));
+  store->set(JSRegExp::kFlagsIndex, Smi::FromInt(flags));
   store->set(JSRegExp::kIrregexpLatin1CodeIndex, uninitialized);
   store->set(JSRegExp::kIrregexpUC16CodeIndex, uninitialized);
   store->set(JSRegExp::kIrregexpLatin1CodeSavedIndex, uninitialized);