ART: X86: Improve multiply in div/rem by literal

Rewrite the multiplication of the magic number by the dividend to save
one instruction by multiplying directly from the dividend, rather than
loading the dividend into EAX/RAX first.

Change-Id: I7934243d90c0739a7f11a8d70f6fb2c000144587
Signed-off-by: Mark Mendell <mark.p.mendell@intel.com>