Simplify CheckPrototypeMaps.

Simplify CheckPrototypeMaps.

This instruction only depends on the prototype and the holder and can
completely ignore the receiver and its map.

This change also fixes a small bug on arm where a cell was loaded
instead of the prototype from new space.

Committed: http://code.google.com/p/v8/source/detail?r=6290

[fschneider, 2011-01-12 22:45:01]

LGTM!

http://codereview.chromium.org/6094020/diff/3001/src/hydrogen-instructions.h
File src/hydrogen-instructions.h (right):

http://codereview.chromium.org/6094020/diff/3001/src/hydrogen-instructions.h#...
src/hydrogen-instructions.h:1643: ASSERT(!Heap::allow_allocation(false));
I think
 
ASSERT(!Heap::IsAllocationAllowed());

would be read a little better here and assert the same property.