ES6 class syntax should allow static setters and getters

ES6 class syntax should allow static setters and getters
https://bugs.webkit.org/show_bug.cgi?id=143180

Source/JavaScriptCore:

Reviewed by Filip Pizlo

Apparently I misread the spec when I initially implemented parseClass.
ES6 class syntax allows static getters and setters so just allow that.

* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseClass):

LayoutTests:

Reviewed by Filip Pizlo.

Added test cases.

* js/class-syntax-declaration-expected.txt:
* js/class-syntax-expression-expected.txt:
* js/script-tests/class-syntax-declaration.js:
* js/script-tests/class-syntax-expression.js:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@182218 268f45cc-cd09-0410-ab3c-d52691b4dbfc