Experimental: a quick hack to allow different live values to flow down...

Experimental: a quick hack to allow different live values to flow down
the two CFG edges at a branch.  The values on the frame flow to the
labeled block, and the values on the frame and all live non-frame
references (results) flow to the fall-through.

The hack is to save and restore non-frame references whenever the code
generator's frame is switched.  Once "MakeMergable" goes away and the
merge code is moved from the source to the destination block, this
will be unnecessary.

Committed: http://code.google.com/p/v8/source/detail?r=1048

[Kevin Millikin (Chromium), 2009-01-08 12:12:37]

This is unpleasant from an API, an engineering, and a moral standpoint.  It is
temporary.

[William Hesse, 2009-01-08 12:28:27]

LGTM.