[oilpan] Add checks to new operator

[oilpan] Add checks to new operator

Check in the new operator that the size matches the class on which the template
is specialized. This is a prerequisite for the next stage where the allocator
(via template specialization) knows enough about the type it is allocating to
be able to visit it if there is a GC before it is adopted.

R=ager@chromium.org, vegorov@chromium.org
BUG=

[Mads Ager (chromium), 2013-06-11 06:42:43]

I wonder if there is anything we can do that is less intrusive? Having to
override new with these macros (even in cases where everything is OK) is not
very nice.

https://codereview.chromium.org/16267005/diff/1/Source/heap/Heap.h
File Source/heap/Heap.h (right):

https://codereview.chromium.org/16267005/diff/1/Source/heap/Heap.h#newcode445
Source/heap/Heap.h:445: // If this assert fails then you are inheriting this
method instead of
This comment seems to belong on the inherited new operator in the public section
below. Then this macro should have a comment about when to use it similar to the
one for OVERRIDE_NEW_ALL_SUBCLASSES_HAVE_DYNAMIC_ACCEPT.