REGRESSION(r160213): Crash in js/dom/JSON-parse.html
https://bugs.webkit.org/show_bug.cgi?id=125335

Reviewed by Mark Lam.

Changed _llint_op_catch to materialize the VM via the scope chain instead of 
the CodeBlock.  CallFrames always have a scope chain, but may have a null CodeBlock.

* llint/LowLevelInterpreter32_64.asm:
(_llint_op_catch):
* llint/LowLevelInterpreter64.asm:
(_llint_op_catch):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@160221 268f45cc-cd09-0410-ab3c-d52691b4dbfc