On x86 modified the generated instructions for case "divide by 2".

As we can use fewer instructions to represent HDiv when divide by2.

Gordon Peak device we see the improvement with below benchmark.
SPECjvm2008-4T	compiler.compiler	1.50%
jArtBand_all_1T	fmath	                4.50%

Test: 411-checker-hdiv-hrem-pow2, test.py --host

Change-Id: I2e6458abd082553f3a04f3d30e76c973bc902432
Signed-off-by: Atul Bajaj <atul.bajaj@intel.com>