spirv: Silence "Decoration not allowed on struct members: SpvDecorationRestrict"

VK-GL-CTS causes tons of these due to a bug in glslang, to the point where
it's hard to find actual issues in test logs.  Disable the warning for
now, with a link to the issue we're waiting on being resolved.

Acked-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15332>

src/compiler/spirv/spirv_to_nir.c

@@ -1116,7 +1116,6 @@ struct_member_decoration_cb(struct vtn_builder *b,
    case SpvDecorationGLSLShared:
    case SpvDecorationGLSLPacked:
    case SpvDecorationInvariant:
-   case SpvDecorationRestrict:
    case SpvDecorationAliased:
    case SpvDecorationConstant:
    case SpvDecorationIndex:
@@ -1130,6 +1129,14 @@ struct_member_decoration_cb(struct vtn_builder *b,
                spirv_decoration_to_string(dec->decoration));
       break;
 
+   case SpvDecorationRestrict:
+      /* While "Restrict" is invalid for struct members, glslang incorrectly
+       * generates it and it ends up hiding actual driver issues in a wall of
+       * spam from deqp-vk.  Return it to the above block once the issue is
+       * resolved.  https://github.com/KhronosGroup/glslang/issues/703
+       */
+      break;
+
    case SpvDecorationXfbBuffer:
    case SpvDecorationXfbStride:
       /* This is handled later by var_decoration_cb in vtn_variables.c */