Regressions on trunk at revision 227915 vs revision 227888

[H.J. Lu ia32]

New failures:

New passes:
FAIL: gcc.dg/guality/pr54970.c   -Os  line 15 a[0] == 1
FAIL: gcc.dg/guality/pr54970.c   -Os  line 20 a[0] == 1
FAIL: gcc.dg/guality/pr54970.c   -Os  line 25 a[0] == 1
FAIL: gcc.dg/guality/pr54970.c   -Os  line 31 a[0] == 4
FAIL: gcc.dg/guality/pr54970.c   -Os  line 36 a[0] == 4
FAIL: gcc.dg/guality/pr54970.c   -Os  line 45 a[0] == 4
FAIL: gcc.dg/guality/pr54970.c   -Os  line 45 p[-2] == 4
FAIL: gcc.dg/guality/pr54970.c   -Os  line 45 q[-1] == 4