nir: Eliminate nir_op_f2b

Builds on the work of !15121.  This gets to delete even more code
because many drivers shared a lot of code for i2b and f2b.

No shader-db or fossil-db changes on any Intel platform.

v2: Rebase on 1a35acd8d9.

v3: Update a comment in nir_opcodes_c.py. Suggested by Konstantin.

v4: Another rebase. Remove f2b stuff from Midgard.

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20509>

src/broadcom/compiler/nir_to_vir.c

@@ -1210,11 +1210,6 @@ ntq_emit_comparison(struct v3d_compile *c,
                 vir_set_pf(c, vir_SUB_dest(c, nop, src0, src1), V3D_QPU_PF_PUSHC);
                 break;
 
-        case nir_op_f2b32:
-                vir_set_pf(c, vir_FMOV_dest(c, nop, src0), V3D_QPU_PF_PUSHZ);
-                cond_invert = true;
-                break;
-
         default:
                 return false;
         }
@@ -1589,7 +1584,6 @@ ntq_emit_alu(struct v3d_compile *c, nir_alu_instr *instr)
                 break;
         }
 
-        case nir_op_f2b32:
         case nir_op_feq32:
         case nir_op_fneu32:
         case nir_op_fge32: