gallium/tgsi: add 64-bitness type check function.

Currently this just doubles, but we'll convert users to this
so making adding 64-bit integers easier.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/gallium/auxiliary/tgsi/tgsi_info.h

@@ -101,6 +101,13 @@ enum tgsi_opcode_type {
    TGSI_TYPE_DOUBLE
 };
 
+static inline bool tgsi_type_is_64bit(enum tgsi_opcode_type type)
+{
+   if (type == TGSI_TYPE_DOUBLE)
+      return true;
+   return false;
+}
+
 enum tgsi_opcode_type
 tgsi_opcode_infer_src_type( uint opcode );