Factor out allocation in CopySpace into a separate CopyAllocator

Factor out allocation in CopySpace into a separate CopyAllocator
https://bugs.webkit.org/show_bug.cgi?id=78610

Reviewed by Oliver Hunt.

Added a new CopyAllocator class, which allows us to do allocations without
having to load the current offset and store the current offset in the current
block. This change will allow us to easily do inline assembly in the JIT for
array allocations.

* GNUmakefile.list.am:
* JavaScriptCore.gypi:
* JavaScriptCore.vcproj/JavaScriptCore/JavaScriptCore.vcproj:
* JavaScriptCore.xcodeproj/project.pbxproj:
* heap/CopiedAllocator.h: Added.
(JSC):
(CopiedAllocator):
(JSC::CopiedAllocator::currentBlock):
(JSC::CopiedAllocator::CopiedAllocator):
(JSC::CopiedAllocator::allocate):
(JSC::CopiedAllocator::fitsInCurrentBlock):
(JSC::CopiedAllocator::wasLastAllocation):
(JSC::CopiedAllocator::startedCopying):
(JSC::CopiedAllocator::resetCurrentBlock):
(JSC::CopiedAllocator::currentUtilization):
(JSC::CopiedAllocator::resetLastAllocation):
* heap/CopiedBlock.h:
(CopiedBlock):
* heap/CopiedSpace.cpp: Moved some stuff from CopiedSpaceInlineMethods to here because we
weren't really getting any benefits from having such big functions in a header file.
(JSC::CopiedSpace::CopiedSpace):
(JSC):
(JSC::CopiedSpace::init):
(JSC::CopiedSpace::tryAllocateSlowCase):
(JSC::CopiedSpace::tryAllocateOversize):
(JSC::CopiedSpace::tryReallocate):
(JSC::CopiedSpace::tryReallocateOversize):
(JSC::CopiedSpace::doneFillingBlock):
(JSC::CopiedSpace::doneCopying):
(JSC::CopiedSpace::getFreshBlock):
* heap/CopiedSpace.h:
(CopiedSpace):
* heap/CopiedSpaceInlineMethods.h:
(JSC):
(JSC::CopiedSpace::startedCopying):
(JSC::CopiedSpace::addNewBlock):
(JSC::CopiedSpace::allocateNewBlock):
(JSC::CopiedSpace::fitsInBlock):
(JSC::CopiedSpace::tryAllocate):
(JSC::CopiedSpace::allocateFromBlock):
* heap/Heap.cpp:
(JSC::Heap::collectAllGarbage):
* heap/HeapBlock.h:
(HeapBlock):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@108267 268f45cc-cd09-0410-ab3c-d52691b4dbfc