make frag fr_type a bitfield

[Alan Modra]

For better packing of struct frag.

	* frags.h (struct frag <fr_type>): Use ENUM_BITFIELD.

diff --git a/gas/frags.h b/gas/frags.h
index c2fea09a8f6..ac245b4c951 100644
--- a/gas/frags.h
+++ b/gas/frags.h
@@ -78,7 +78,7 @@ struct frag {
   unsigned int insn_addr:6;
 
   /* What state is my tail in? */
-  relax_stateT fr_type;
+  ENUM_BITFIELD (_relax_state) fr_type : 8;
   relax_substateT fr_subtype;
 
 #ifdef USING_CGEN

-- 
Alan Modra