Regressions on trunk at revision 232717 vs revision 232671

[H.J. Lu]

New failures:

New passes:
FAIL: g++.dg/cpp0x/constexpr-reinterpret1.C  -std=c++11  (test for errors, line 21)
FAIL: g++.dg/cpp0x/constexpr-reinterpret1.C  -std=c++11 (test for excess errors)
FAIL: g++.dg/cpp0x/constexpr-reinterpret1.C  -std=c++14  (test for errors, line 21)
FAIL: g++.dg/cpp0x/constexpr-reinterpret1.C  -std=c++14 (test for excess errors)