nir/spirv: Add support for SpvDecorationColMajor

src/glsl/nir/spirv_to_nir.c

@@ -365,6 +365,8 @@ struct_member_decoration_cb(struct vtn_builder *b,
    case SpvDecorationOffset:
       ctx->type->offsets[member] = dec->literals[0];
       break;
+   case SpvDecorationColMajor:
+      break; /* Nothing to do here.  Column-major is the default. */
    default:
       unreachable("Unhandled member decoration");
    }