Do not emit double values at their use sites.

Do not emit double values at their use sites.

Revert part of r14179. From the regression test's comment:

Currently, the gap resolver doesn't handle moves from a ConstantOperand to a
DoubleRegister, but these kind of moves appeared when HConstant::EmitAtUses
was changed to allow special double values (-0, NaN, hole). So we should
either enhance the gap resolver or make sure that such moves don't happen.

BUG=chrome:234101
Committed: http://code.google.com/p/v8/source/detail?r=14394

[mvstanton, 2013-04-23 12:53:38]

Thanks for catching that Sven, looks good. I'll investigate handling things
correctly in the gap resolver if I need to bring this back.

lgtm.

[Sven Panne, 2013-04-23 13:08:17]

Committed patchset #1 manually as r14394 (presubmit successful).