https://bugs.webkit.org/show_bug.cgi?id=87210

Reviewed by Gavin Barraclough.

This is a step toward incremental DOM finalization.

* heap/Heap.cpp:
(JSC::Heap::~Heap): Explicitly call freeAllBlocks() instead of relying
implicitly on all blocks thinking they're empty. In future, we may
choose to tear down the heap without first setting all data structures
to "empty".

* heap/MarkedBlock.h:
(JSC::MarkedBlock::isEmpty):
(JSC::MarkedBlock::gatherDirtyCells): Renamed markCountIsZero to isEmpty,
in preparation for making it check for outstanding finalizers in addition
to marked cells.

* heap/MarkedSpace.cpp:
(Take):
(JSC::Take::Take):
(JSC::Take::operator()):
(JSC::Take::returnValue):
(JSC::MarkedSpace::shrink):
(JSC::MarkedSpace::freeAllBlocks): Refactored the "Take" functor to support
a conditional isEmpty check, so it dould be shared by shrink() and freeAllBlocks().

* heap/WeakBlock.cpp:
(JSC::WeakBlock::WeakBlock):
(JSC::WeakBlock::visitLiveWeakImpls):
(JSC::WeakBlock::visitDeadWeakImpls):
* heap/WeakBlock.h:
(WeakBlock):
(JSC::WeakBlock::isEmpty):
* heap/WeakSet.cpp:
(JSC::WeakSet::sweep):
(JSC::WeakSet::shrink): Use isEmpty(), in preparation for changes in
its implementation.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@118210 268f45cc-cd09-0410-ab3c-d52691b4dbfc