Regressions on trunk at revision 171606 vs revision 171604

[H.J. Lu Intel64 Core 2/i7]

New failures:
FAIL: gcc.dg/guality/sra-1.c  -O2 -flto -flto-partition=none  line 43 a.j == 14
FAIL: gcc.dg/guality/sra-1.c  -O3 -fomit-frame-pointer  line 43 a.j == 14
FAIL: gcc.dg/guality/sra-1.c  -O3 -g  line 43 a.j == 14

New passes:
FAIL: gcc.dg/guality/sra-1.c  -O2  line 43 a.j == 14
FAIL: gcc.dg/guality/sra-1.c  -Os  line 43 a.j == 14
FAIL: gcc.dg/guality/vla-1.c  -O2 -flto -flto-partition=none  line 17 sizeof (a) == 6