Experimental: processor flags are not preserved across CFG edges...

Experimental: processor flags are not preserved across CFG edges
targeting labeled basic blocks.  Merge code may be generated at the
block exit which could potentially destroy a value in the flags
register.

This solution is to always materialize the flag result in a register.
The generated code is known to be bad but (more) correct and will have
to be fixed as a future change.

Committed: http://code.google.com/p/v8/source/detail?r=1075