Regressions on trunk at revision 239178 vs revision 239166

[Intel Automatic Testing System [ia32 Core AVX2]]

New failures:

New passes:
FAIL: g++.dg/cpp0x/constexpr-cast.C  -std=c++11  (test for errors, line 10)
FAIL: g++.dg/cpp0x/constexpr-cast.C  -std=c++11  (test for errors, line 11)
FAIL: g++.dg/cpp0x/constexpr-cast.C  -std=c++11 (test for excess errors)
FAIL: g++.dg/cpp0x/constexpr-cast.C  -std=c++14  (test for errors, line 10)
FAIL: g++.dg/cpp0x/constexpr-cast.C  -std=c++14  (test for errors, line 11)
FAIL: g++.dg/cpp0x/constexpr-cast.C  -std=c++14 (test for excess errors)