Move cmov pseudo instructions to InstrCompiler,

convert all the rest of the cmovs to the multiclass,
with good results:

 X86InstrCMovSetCC.td |  598 +--------------------------------------------------
 X86InstrCompiler.td  |   61 +++++
 2 files changed, 77 insertions(+), 582 deletions(-)

llvm-svn: 115707