Split single slots buffer into per page slots buffers.

Split single slots buffer into per page slots buffers.

Once page's slots buffer overflows it's evacuation is disabled.

And CPU::FlushICache to RecordWriteStub::Patch to make it valgrind friendly.

Don't try to compact the first page of space. It is usually extremely popular. 

R=erik.corry@gmail.com

Committed: http://code.google.com/p/v8/source/detail?r=8582

[Erik Corry, 2011-07-08 13:02:38]

LGTM

http://codereview.chromium.org/7326012/diff/1/src/mark-compact.cc
File src/mark-compact.cc (right):

http://codereview.chromium.org/7326012/diff/1/src/mark-compact.cc#newcode3180
src/mark-compact.cc:3180: SlotsBuffer* buffer = reinterpret_cast<SlotsBuffer*>(
This could just be new SlotsBuffer().

http://codereview.chromium.org/7326012/diff/1/src/mark-compact.h
File src/mark-compact.h (right):

http://codereview.chromium.org/7326012/diff/1/src/mark-compact.h#newcode283
src/mark-compact.h:283: SlotsBuffer() { UNREACHABLE(); }
I think you should use DISALLOW_IMPLICIT_CONSTRUCTORS instead.

http://codereview.chromium.org/7326012/diff/1/src/mark-compact.h#newcode353
src/mark-compact.h:353: return reinterpret_cast<ObjectSlot*>(this + 1);
This casting seems unnecessary.  You could just have an array as a member of the
class.  Then you could allocate with new

http://codereview.chromium.org/7326012/diff/1/src/mark-compact.h#newcode485
src/mark-compact.h:485: if (object_page->owner()->identity() == OLD_DATA_SPACE)
{
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