Update testcase comment.

Update testcase comment.
   addb.cgs addd.cgs addi.cgs andb.cgs andd.cgs andw.cgs
   ashub.cgs ashub_i.cgs ashud.cgs ashud_i.cgs ashuw.cgs
   ashuw_i.cgs cmpi.cgs cmpw.cgs jlt.cgs jump.cgs loadd.cgs
   loadw.cgs lshb.cgs lshb_i.cgs lshd.cgs lshd_i.cgs lshw.cgs
   lshw_i.cgs movb.cgs movd.cgs movw.cgs movxb.cgs movxw.cgs
   movzb.cgs movzw.cgs mulb.cgs muluw.cgs mulw.cgs orb.cgs
   ord.cgs orw.cgs pop1.cgs pop2.cgs pop3.cgs popret1.cgs
   popret2.cgs popret3.cgs push1.cgs push2.cgs push3.cgs

Added BIT operation testcases:
  cbitb.cgs cbitw.cgs sbitb.cgs sbitw.cgs tbitb.cgs tbit.cgs and tbitw.cgs