Experimental: introduce a simple way to avoid generating jumps to...

Experimental: introduce a simple way to avoid generating jumps to
jumps for empty merge code and to avoid duplicating merge code.

Use the equality predicate on virtual frames to determine if a
forward-jump frame equals the entry frame for a block, or if a pair of
forward-jump frames are equal.

Committed: http://code.google.com/p/v8/source/detail?r=1310

[Kasper Lund, 2009-02-19 09:49:09]

LGTM.

http://codereview.chromium.org/20488/diff/1/4
File src/jump-target-ia32.cc (right):

http://codereview.chromium.org/20488/diff/1/4#newcode133
Line 133: void JumpTarget::Bind(int mergable_elements) {
I don't know if it's a good idea or not, but the Bind code is almost shareable
between ARM and IA32. Maybe you should share it long term?

[Mads Ager (chromium), 2009-02-19 09:59:50]

LGTM