https://bugs.webkit.org/show_bug.cgi?id=123506

Reviewed by Mark Lam.

Source/JavaScriptCore:

Add ParserState as an abstraction and use that to save and restore
the parser state around nested functions (We'll need to use this in
more places in future).  Also fix a minor error typo this testcases
hit.

* parser/Parser.cpp:
(JSC::::parseFunctionInfo):
(JSC::::parseAssignmentExpression):
* parser/Parser.h:
(JSC::Parser::saveState):
(JSC::Parser::restoreState):

LayoutTests:

Update and add tests

* js/dom/assign-expected.txt:
* js/function-toString-parentheses-expected.txt:
* js/parser-syntax-check-expected.txt:
* js/script-tests/parser-syntax-check.js:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158425 268f45cc-cd09-0410-ab3c-d52691b4dbfc