Tiny Parser fix: init identifiers.

This bug went unnoticed because PreParserIdentifier and Handle<String> have
default ctors which create a null identifier, but this it not true for all
possible identifier types (especially pointers).

R=ulan@chromium.org
BUG=

Review URL: https://codereview.chromium.org/238253012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20834 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/preparser.h

@@ -2047,7 +2047,7 @@ ParserBase<Traits>::ParseMemberExpression(bool* ok) {
     Consume(Token::FUNCTION);
     int function_token_position = position();
     bool is_generator = allow_generators() && Check(Token::MUL);
-    IdentifierT name;
+    IdentifierT name = this->EmptyIdentifier();
     bool is_strict_reserved_name = false;
     Scanner::Location function_name_location = Scanner::Location::invalid();
     FunctionLiteral::FunctionType function_type =