nir/spirv: handle SpvStorageClassCrossWorkgroup

v2: rename nir_var_global to nir_var_mem_global

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Acked-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/compiler/nir/nir.h

@@ -104,6 +104,7 @@ typedef enum {
    nir_var_system_value    = (1 << 6),
    nir_var_mem_ssbo        = (1 << 7),
    nir_var_mem_shared      = (1 << 8),
+   nir_var_mem_global      = (1 << 9),
    nir_var_all             = ~0,
 } nir_variable_mode;