MIPS: Skip gcc.dg/loop-8.c due to additional invariants

gcc/
	PR rtl-optimization/66669
	* gcc.dg/loop-8.c: Skip for MIPS due to extra invariants.

From-SVN: r239288

gcc/testsuite/ChangeLog

+2016-08-09  Matthew Fortune  <matthew.fortune@imgtec.com>
+
+	PR rtl-optimization/66669
+	* gcc.dg/loop-8.c: Skip for MIPS due to extra invariants.
+
 2016-08-09  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/72824

gcc/testsuite/gcc.dg/loop-8.c

 /* { dg-do compile } */
 /* { dg-options "-O1 -fdump-rtl-loop2_invariant" } */
-/* { dg-skip-if "unexpected IV" { "hppa*-*-* visium-*-*" } { "*" } { "" } } */
+/* { dg-skip-if "unexpected IV" { "hppa*-*-* mips*-*-* visium-*-*" } { "*" } { "" } } */
 
 void
 f (int *a, int *b)