Regressions on trunk at revision 207172 vs revision 207171

[H.J. Lu Intel64]

New failures:
FAIL: c-c++-common/tsan/simple_race.c  -O0  execution test
FAIL: gcc.dg/guality/pr43051-1.c  -O1  line 40 v == 1
FAIL: gcc.dg/guality/pr43051-1.c  -O1  line 41 e == &a[1]
FAIL: gcc.dg/guality/pr43051-1.c  -Os  line 35 v == 1
FAIL: gcc.dg/guality/pr43051-1.c  -Os  line 36 e == &a[1]
FAIL: gcc.dg/guality/pr43051-1.c  -Os  line 40 v == 1
FAIL: gcc.dg/guality/pr43051-1.c  -Os  line 40 v == 1
FAIL: gcc.dg/guality/pr43051-1.c  -Os  line 41 e == &a[1]
FAIL: gcc.dg/guality/pr43051-1.c  -Os  line 41 e == &a[1]

New passes: