Extend some operations to range types.

Extend some operations to range types.

This is a reland of 22945, which failed to build on Windows due to
(some versions of?) Visual Studio lacking copysign().

R=rossberg@chromium.org
BUG=

Committed: https://code.google.com/p/v8/source/detail?r=22977

[rossberg, 2014-08-07 14:12:57]

LGTM with nit

https://codereview.chromium.org/448093002/diff/1/src/types.cc
File src/types.cc (right):

https://codereview.chromium.org/448093002/diff/1/src/types.cc#newcode19
src/types.cc:19: return x <= y && (!IsMinusZero(y) || x != 0 || IsMinusZero(x));
Nit: I would order this

(x != 0 || IsMinusZero(x) || !IsMinusZero(y))

[neis, 2014-08-07 15:30:29]

Committed patchset #1 manually as 22977 (presubmit successful).