[PATCH, COMMITTED] Fix PPC rfebb test case results

My gas patch in the URL below fixed a problem with the assembly and
disassembly of the rfebb instruction:

    https://sourceware.org/ml/binutils/2015-06/msg00190.html

This patch updates the gdb test suite to match the new disassembly
behavior.  Committed as obvious.

Peter

gdb/testsuite/
	* gdb.arch/powerpc-power.exp <rfebb>: Fixup test results.
	* gdb.arch/powerpc-power.s <rfebb>: Likewise.

diff --git a/gdb/testsuite/gdb.arch/powerpc-power.exp
b/gdb/testsuite/gdb.arch/powerpc-power.exp
index 15a59dd..96d623f 100644
--- a/gdb/testsuite/gdb.arch/powerpc-power.exp
+++ b/gdb/testsuite/gdb.arch/powerpc-power.exp
@@ -194,8 +194,8 @@ func_check +500  "treclaim. r24"
 func_check +504  "trechkpt."
 func_check +508  "tsuspend."
 func_check +512  "tresume."
-func_check +516  "rfebb"
-func_check +520  "rfebb   1"
+func_check +516  "rfebb   0"
+func_check +520  "rfebb"
 func_check +524  "bctar-  12,4\\*cr5\\+gt"
 func_check +528  "bctarl- 4,4\\*cr1\\+so"
 func_check +532  "bctar\\+  12,4\\*cr3\\+lt"
diff --git a/gdb/testsuite/gdb.arch/powerpc-power.s
b/gdb/testsuite/gdb.arch/powerpc-power.s
index 335e35b..ed17b2e 100644
--- a/gdb/testsuite/gdb.arch/powerpc-power.s
+++ b/gdb/testsuite/gdb.arch/powerpc-power.s
@@ -147,7 +147,7 @@ func:
 	.long	0x7c0007dd	/* <+504>: trechkpt.                 */
 	.long	0x7c0005dd	/* <+508>: tsuspend.                 */
 	.long	0x7c2005dd	/* <+512>: tresume.                  */
-	.long	0x4c000124	/* <+516>: rfebb                     */
+	.long	0x4c000124	/* <+516>: rfebb   0                 */
 	.long	0x4c000924	/* <+520>: rfebb   1                 */
 	.long	0x4d950460	/* <+524>: bctar-  12,4*cr5+gt       */
 	.long	0x4c870461	/* <+528>: bctarl- 4,4*cr1+so        */