nir: Add nir_op_vec helper

with that we can simplify code where nir vectors are created

v2: merge both lines in nir_vec

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

src/compiler/nir/nir_builder.h

@@ -489,19 +489,7 @@ nir_build_alu_src_arr(nir_builder *build, nir_op op, nir_ssa_def **srcs)
 static inline nir_ssa_def *
 nir_vec(nir_builder *build, nir_ssa_def **comp, unsigned num_components)
 {
-   switch (num_components) {
-   case 4:
-      return nir_vec4(build, comp[0], comp[1], comp[2], comp[3]);
-   case 3:
-      return nir_vec3(build, comp[0], comp[1], comp[2]);
-   case 2:
-      return nir_vec2(build, comp[0], comp[1]);
-   case 1:
-      return comp[0];
-   default:
-      unreachable("bad component count");
-      return NULL;
-   }
+   return nir_build_alu_src_arr(build, nir_op_vec(num_components), comp);
 }
 
 /**