Fix handling of -0 in the unary-op IC and avoid repeated patching/transitions.

Fix handling of -0 in the unary-op IC and avoid repeated patching/transitions.

When the stub return a heap number we do a state transition to
a version HEAP_NUMBER that can handle -0.

There is room for further improvement in the typefeedback for the
case of -0. This change however does not address this and only fixes
the acute issue.
Committed: http://code.google.com/p/v8/source/detail?r=7944

[William Hesse, 2011-05-18 16:12:03]

LGTM.

[William Hesse, 2011-05-18 16:21:30]

Looks better to me now that it compiles.

On 2011/05/18 16:12:03, William Hesse wrote:
> LGTM.