Regressions on trunk at revision 275969 vs revision 275924

[H.J. Lu (Intel64 Core i7)]

New failures:
FAIL: gcc.dg/pr88031.c (internal compiler error)
FAIL: gcc.dg/pr88031.c (internal compiler error)
FAIL: gcc.dg/pr88031.c (test for excess errors)
FAIL: gcc.dg/pr88031.c (test for excess errors)

New passes: