rs6000 - add speculation_barrier pattern

This patch reworks the existing rs6000_speculation_barrier pattern to
work with the new __builtin_sepculation_safe_value() intrinsic.  The
change is trivial as it simply requires renaming the existing speculation
barrier pattern.

So the total patch is to delete 14 characters!

	* config/rs6000/rs6000.md (speculation_barrier): Renamed from
	rs6000_speculation_barrier.
	* config/rs6000/rs6000.c (rs6000_expand_builtin): Adjust for
	new barrier pattern name.

From-SVN: r263197

gcc/ChangeLog

 2018-08-01  Richard Earnshaw  <rearnsha@arm.com>
 
+	* config/rs6000/rs6000.md (speculation_barrier): Renamed from
+	rs6000_speculation_barrier.
+	* config/rs6000/rs6000.c (rs6000_expand_builtin): Adjust for
+	new barrier pattern name.
+
+2018-08-01  Richard Earnshaw  <rearnsha@arm.com>
+
 	* config/i386/i386.md (unspecv): Add UNSPECV_SPECULATION_BARRIER.
 	(speculation_barrier): New insn.
 

gcc/config/rs6000/rs6000.c

@@ -15836,7 +15836,7 @@ rs6000_expand_builtin (tree exp, rtx target, rtx subtarget ATTRIBUTE_UNUSED,
 
     case MISC_BUILTIN_SPEC_BARRIER:
       {
-	emit_insn (gen_rs6000_speculation_barrier ());
+	emit_insn (gen_speculation_barrier ());
 	return NULL_RTX;
       }
 

gcc/config/rs6000/rs6000.md

@@ -12641,7 +12641,7 @@
   return "ori 2,2,0";
 })
 
-(define_insn "rs6000_speculation_barrier"
+(define_insn "speculation_barrier"
   [(unspec_volatile:BLK [(const_int 0)] UNSPECV_SPEC_BARRIER)]
   ""
   "ori 31,31,0")