x86_64: Simplify FlushIns
x86_64: Simplify FlushIns

This change simplifies FlushIns for x86_64.

Change-Id: I2b41fae32603e0951e3847cc1e4f9c6bfab349a0
Signed-off-by: Serguei Katkov <53c1eb3349c33a81de4c7fece05dd168a3eb410e@intel.com>
Signed-off-by: Dmitry Petrochenko <3a759f8171aff1439cfbcab3315fbbed4c685172@intel.com>

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst