Regressions on trunk at revision 180228 vs revision 180200

[Kirill Yukhin [Intel64 Core i7 AVX]]

New failures:
FAIL: gcc.dg/torture/vshuf-v4di.c  -O2  (internal compiler error)
FAIL: gcc.dg/torture/vshuf-v4di.c  -O2  (internal compiler error)
FAIL: gcc.dg/torture/vshuf-v4di.c  -O2  (test for excess errors)
FAIL: gcc.dg/torture/vshuf-v4di.c  -O2  (test for excess errors)
FAIL: gcc.dg/torture/vshuf-v8si.c  -O2  (internal compiler error)
FAIL: gcc.dg/torture/vshuf-v8si.c  -O2  (internal compiler error)
FAIL: gcc.dg/torture/vshuf-v8si.c  -O2  (test for excess errors)
FAIL: gcc.dg/torture/vshuf-v8si.c  -O2  (test for excess errors)

New passes:
FAIL: gcc.dg/plugin/plugindir1.c (test for excess errors)
FAIL: gcc.dg/plugin/plugindir1.c (test for excess errors)
FAIL: gcc.dg/plugin/plugindir2.c (test for excess errors)
FAIL: gcc.dg/plugin/plugindir2.c (test for excess errors)
FAIL: gcc.dg/plugin/plugindir3.c (test for excess errors)
FAIL: gcc.dg/plugin/plugindir3.c (test for excess errors)
FAIL: gcc.dg/plugin/plugindir4.c (test for excess errors)
FAIL: gcc.dg/plugin/plugindir4.c (test for excess errors)