Very small optimization of ARM compare stub.

Small optimization of ARM compare stub.  Reverse all references to
left and right sides of the comparison to reflect reality.  Don't
check explicitly for NaNs when using VFP3 since the compare
operation can signal this case with the v flag.  Use cmp instead
of tst in the fast compilers since tst leaves the v flag unchanged
and thus can only work by accident on non-equality comparisons.

Committed: http://code.google.com/p/v8/source/detail?r=3625

[Lasse Reichstein, 2010-01-17 11:52:00]

LGTM

http://codereview.chromium.org/551048/diff/1002/2002
File src/assembler.cc (right):

http://codereview.chromium.org/551048/diff/1002/2002#newcode709
src/assembler.cc:709: return fmod(x, y);
Using fmod is bad on Windows 64.
Use modulo(x,y) from platform.h instead.