Simplify virtual frame by removing the virtual stack pointer, which...

Simplify virtual frame by removing the virtual stack pointer, which
can be derived from the backing store's length.

Committed: http://code.google.com/p/v8/source/detail?r=780

[iposva, 2008-11-17 17:11:53]

Comments from left field.

-Ivan

PS. Otherwise LGTM and thanks for the cleanup.

http://codereview.chromium.org/11406/diff/1/4
File src/virtual-frame-arm.cc (right):

http://codereview.chromium.org/11406/diff/1/4#newcode46
Line 46: frame_pointer_(-1) {
Ideally you could define an illegal index and use that wherever the VirtualFrame
has not yet been setup and in other similar situations.

http://codereview.chromium.org/11406/diff/1/4#newcode111
Line 111: Adjust(4);
Can you please document the magic numbers in this file? I assume 4 is the size
of the arm native stack frame. A simple comment referring to the line below
would do.