Regressions on trunk at revision 187674 vs revision 187650

[H.J. Lu Intel64]

New failures:
FAIL: gfortran.dg/pr46519-2.f90 scan-assembler avx_vzeroupper
FAIL: gfortran.dg/pr46519-2.f90 scan-assembler avx_vzeroupper

New passes:
FAIL: g++.dg/torture/pr46154.C  -O1  (internal compiler error)
FAIL: g++.dg/torture/pr46154.C  -O1  (internal compiler error)
FAIL: g++.dg/torture/pr46154.C  -O1  (test for excess errors)
FAIL: g++.dg/torture/pr46154.C  -O1  (test for excess errors)
FAIL: gcc.dg/pr53352.c execution test
FAIL: gcc.dg/pr53352.c execution test