Reviewed by Cameron Zwarich and Oliver Hunt.
        
        Re-Fixed <rdar://problem/6406045> REGRESSION: Stack overflow on PowerPC on
        fast/workers/use-machine-stack.html (22531)
        
        SunSpider reports no change.
        
        Use a larger recursion limit on the main thread (because we can, and
        there's some evidence that it may improve compatibility), and a smaller
        recursion limit on secondary threads (because they tend to have smaller
        stacks).

        * interpreter/Interpreter.cpp:
        (JSC::Interpreter::execute):
        (JSC::Interpreter::prepareForRepeatCall):
        * interpreter/Interpreter.h:
        (JSC::): Ditto. I wrote the recursion test slightly funny, so that the
        common case remains a simple compare to constant.

        * runtime/ArrayPrototype.cpp:
        (JSC::arrayProtoFuncToString):
        (JSC::arrayProtoFuncToLocaleString):
        (JSC::arrayProtoFuncJoin): Conservatively, set the array recursion limits
        to the lower, secondary thread limit. We can do something fancier if
        compatibility moves us, but this seems sufficient for now.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@42734 268f45cc-cd09-0410-ab3c-d52691b4dbfc