glsl: Stop lowering ir_quadop_vector.

Now that everybody goes through NIR, glsl_to_nir is happy to handle the
instruction and turn it into nir_op_vec4 instead of going to a temp
variable and back.

No changes on freedreno shader-db.

Reviewed-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16363>

src/compiler/glsl/meson.build

@@ -174,7 +174,6 @@ files_libglsl = files(
   'lower_tess_level.cpp',
   'lower_vec_index_to_cond_assign.cpp',
   'lower_vec_index_to_swizzle.cpp',
-  'lower_vector.cpp',
   'lower_vector_derefs.cpp',
   'lower_vector_insert.cpp',
   'lower_vertex_id.cpp',