Add support for the following AMD instructions added in their July 2007

Add support for the following AMD instructions added in their July 2007
documentation update:
 - LZCNT
 - POPCNT
 - EXTRQ
 - INSERTQ
 - MOVNTSD
 - MOVNTSS

This required some new tricks in the x86 code, as EXTRQ and INSERTQ have
two imm8 parameters (the first one of which goes into the EA field), and
INSERTQ has a *4* parameter version (xmm1, xmm2, imm8, imm8).  Instead of
globally making the structures 4 wide, we just special-case INSERTQ.

svn path=/trunk/yasm/; revision=1909