Regressions on trunk at revision 248004 vs revision 247962

[H.J. Lu Intel64 Core i7]

New failures:
FAIL: gcc.dg/atomic/c11-atomic-exec-2.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  (internal compiler error)
FAIL: gcc.dg/atomic/c11-atomic-exec-2.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  (test for excess errors)
FAIL: gcc.dg/atomic/c11-atomic-exec-2.c   -O2  (internal compiler error)
FAIL: gcc.dg/atomic/c11-atomic-exec-2.c   -O2  (test for excess errors)
FAIL: gcc.dg/atomic/c11-atomic-exec-2.c   -O3 -g  (internal compiler error)
FAIL: gcc.dg/atomic/c11-atomic-exec-2.c   -O3 -g  (test for excess errors)
FAIL: gcc.dg/atomic/c11-atomic-exec-2.c   -Os  (internal compiler error)
FAIL: gcc.dg/atomic/c11-atomic-exec-2.c   -Os  (test for excess errors)
FAIL: gcc.dg/ubsan/float-cast-overflow-atomic.c   -Os  (internal compiler error)
FAIL: gcc.dg/ubsan/float-cast-overflow-atomic.c   -Os  (test for excess errors)

New passes:
FAIL: gcc.target/i386/cadd.c scan-assembler sbb
FAIL: gfortran.dg/mvbits_7.f90   -O0   (test for warnings, line 28)
FAIL: gfortran.dg/mvbits_7.f90   -O0   (test for warnings, line 28)