Regressions on trunk at revision 218023 vs revision 218015

[i32coreavxi@ecsmtp.ims.intel.com]

New failures:
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

New passes:
FAIL: gcc.dg/guality/pr54970.c   -Os  line 31 *p == 6
FAIL: gcc.dg/guality/pr54970.c   -Os  line 31 *q == 5
FAIL: gcc.dg/guality/pr54970.c   -Os  line 36 *p == 26
FAIL: gcc.dg/guality/pr54970.c   -Os  line 36 *q == 5
FAIL: gcc.dg/guality/pr54970.c   -Os  line 45 p[-1] == 25
FAIL: gcc.dg/guality/pr54970.c   -Os  line 45 p[-2] == 4
FAIL: gcc.dg/guality/pr54970.c   -Os  line 45 *p == 26
FAIL: gcc.dg/guality/pr54970.c   -Os  line 45 q[1] == 26
FAIL: gcc.dg/guality/pr54970.c   -Os  line 45 q[-1] == 4
FAIL: gcc.dg/guality/pr54970.c   -Os  line 45 *q == 25