Regressions on trunk at revision 221171 vs revision 221169

[H.J. Lu ia32]

New failures:

New passes:
FAIL: gcc.target/i386/chkp-strchr.c (internal compiler error)
FAIL: gcc.target/i386/chkp-strchr.c (test for excess errors)
FAIL: gcc.target/i386/pr63995-2.c (internal compiler error)
FAIL: gcc.target/i386/pr63995-2.c (test for excess errors)