on desktop platforms
https://bugs.webkit.org/show_bug.cgi?id=65438

Reviewed by Oliver Hunt.

Source/JavaScriptCore:

The minimum heap size is now 16MB instead of 512KB, provided all of the
following are true:
a) ENABLE(LARGE_HEAP) is set, which currently only happens on
   x86 targets, but could reasonably happen on any platform that is
   known to have a decent amount of RAM.
b) JSGlobalData is initialized with HeapSize = LargeHeap, which
   currently only happens when it's the JSDOMWindowBase in WebCore or
   in the jsc command-line tool.

This is a 4.1% speed-up on SunSpider.

* JavaScriptCore.exp:
* heap/Heap.cpp:
(JSC::Heap::Heap):
(JSC::Heap::collect):
* heap/Heap.h:
* jsc.cpp:
(main):
* runtime/JSGlobalData.cpp:
(JSC::JSGlobalData::JSGlobalData):
(JSC::JSGlobalData::createContextGroup):
(JSC::JSGlobalData::create):
(JSC::JSGlobalData::createLeaked):
(JSC::JSGlobalData::sharedInstance):
* runtime/JSGlobalData.h:
* wtf/Platform.h:

Source/WebCore:

No change in behavior, thus no new tests.

Pass the LargeHeap hint to JSGlobalData when creating the JSC runtime
instance corresponding to non-worker JS code.

* bindings/js/JSDOMWindowBase.cpp:
(WebCore::JSDOMWindowBase::commonJSGlobalData):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@92224 268f45cc-cd09-0410-ab3c-d52691b4dbfc