https://bugs.webkit.org/show_bug.cgi?id=104161

Reviewed by Filip Pizlo.

Source/JavaScriptCore:

This adds a function to the globaldata to empty all code related data
structures (code in the heap and the code cache).
It also adds a function to allow the CodeCache to actually be cleared
at all.

* runtime/CodeCache.h:
(CacheMap):
(JSC::CacheMap::clear):
(JSC::CodeCache::clear):
(CodeCache):
* runtime/JSGlobalData.cpp:
(JSC::JSGlobalData::discardAllCode):
(JSC):
* runtime/JSGlobalData.h:
(JSGlobalData):

Source/WebCore:

Use new discardAllCode() function on the global data, rather than
directly interacting with the heap.

* bindings/js/GCController.cpp:
(WebCore::GCController::discardAllCompiledCode):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@136773 268f45cc-cd09-0410-ab3c-d52691b4dbfc