st/mesa: update inst->info along with inst->op
st/mesa: update inst->info along with inst->op

Otherwise we still have TGSI_OPCODE_CMP's info, which causes a number of
later logic to go wrong. This fixes

dEQP-GLES2.functional.shaders.functions.control_flow.return_in_if_vertex

on nv30.

Signed-off-by: Ilia Mirkin <bcbbb7aa705ec3a5fc5824c01a845186c3d62fca@alum.mit.edu>
Reviewed-by: Marek Olšák <8c7344a1abdb103e79ecfd488098373070c3c70e@amd.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler