i965: Use the tex projector lowering pass instead of hand-rolling it.
i965: Use the tex projector lowering pass instead of hand-rolling it.

This only impacts the ARB_fp path.  We can't quite disable the GLSL-level
lowering pass, because it needs to apply before
brw_do_lower_unnormalized_offset().

total instructions in shared programs: 5667857 -> 5667847 (-0.00%)
instructions in affected programs:     1114 -> 1104 (-0.90%)
helped:                                16
HURT:                                  6

Reviewed-by: Jason Ekstrand <b186559eaedf698788888c8a2559b4efb4db10d6@intel.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler