nir: Recognize mul(b2f(a), b2f(b)) as a logical AND.
nir: Recognize mul(b2f(a), b2f(b)) as a logical AND.

Transform this into b2f(and(a, b)).

total instructions in shared programs: 6205448 -> 6204391 (-0.02%)
instructions in affected programs:     284030 -> 282973 (-0.37%)
helped:                                903
HURT:                                  6

Acked-by: Ian Romanick <2b237cafb16dc45038e85df6c85e74e6d899eba9@intel.com>
Reviewed-by: Connor Abbott <71178acffcc112b21e5858656e5751f5e4aa9364@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler