Start of X86 LIR description.
Start of X86 LIR description.

Change-Id: I34298bf9cf6bfdb022064bc7fdabffae857c8c5c

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