Fix memory leak in Parser after r22314.

R=marja@chromium.org

Review URL: https://codereview.chromium.org/383713002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22317 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/parser.h

@@ -561,6 +561,8 @@ class Parser : public ParserBase<ParserTraits> {
   ~Parser() {
     delete reusable_preparser_;
     reusable_preparser_ = NULL;
+    delete cached_parse_data_;
+    cached_parse_data_ = NULL;
   }
 
   // Parses the source code represented by the compilation info and sets its