Improve x86 long multiply and shifts

Generate inline code for long shifts by constants and do long
multiplication inline. Convert multiplication by a constant to a
shift when we can. Fix some x86 assembler problems and add the new
instructions that were needed (64 bit shifts).

Change-Id: I6237a31c36159096e399d40d01eb6bfa22ac2772
Signed-off-by: Mark Mendell <mark.p.mendell@intel.com>