Add rep movsw to x86 and x86_64 instructions.

Add 'REP MOVSW' as a supported instruction for x86 32 and 64 bit.

Added tests.

Change-Id: I1c615ac1e7fa46c48983c90f791b92be0375c8b8
Signed-off-by: Mark Mendell <mark.p.mendell@intel.com>
7 files changed