For C/C++ semantics, this applies to all the FP comparisons except == and != which require two comparisons due to ordered/unordered requirements.  For == and !=, two comparisons and control flow are still used.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4095
TEST= crosstest/test_fcmp
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/1148023003