Make LiveRange objects 1 word smaller by using a bool instead of enum for register kind.

Make LiveRange objects 1 word smaller by using a bool instead of enum for register kind.
Committed: http://code.google.com/p/v8/source/detail?r=9959

[fschneider, 2011-11-10 15:07:17]

Tiny review to allocate a little less during register allocation.

[Sven Panne, 2011-11-10 15:16:04]

lgtm