Eradicate MQ some more

Nothing uses MQ anymore, but it still shows up in all the dump files.
This patch removes it from CALL_REALLY_USED_REGISTERS so that that does
not happen anymore (it is still a fixed register, there should be no
functional change).


	* config/rs6000/rs6000.h (CALL_REALLY_USED_REGISTERS): Do not
	include MQ.

From-SVN: r239851

gcc/ChangeLog

+2016-08-29  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* config/rs6000/rs6000.h (CALL_REALLY_USED_REGISTERS): Do not
+	include MQ.
+
 2016-08-29  David Malcolm  <dmalcolm@redhat.com>
 
 	* input.c

gcc/config/rs6000/rs6000.h

@@ -1120,7 +1120,7 @@ enum data_align { align_abi, align_opt, align_both };
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, \
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
-   1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1,	   \
+   0, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1,	   \
    /* AltiVec registers.  */			   \
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \