Regressions on trunk at revision 187653 vs revision 187635

[H.J. Lu ia32]

New failures:
FAIL: gcc.dg/pr53352.c execution test

New passes:
FAIL: g++.dg/torture/pr46154.C  -O1  (internal compiler error)
FAIL: g++.dg/torture/pr46154.C  -O1  (test for excess errors)