Regressions on trunk at revision 235044 vs revision 235015

[Intel Automatic Testing System [ia32 Core AVX2]]

New failures:
FAIL: experimental/numeric/lcm.cc (test for excess errors)

New passes:
FAIL: g++.dg/cpp1y/vla11.C  -std=c++11 execution test
FAIL: g++.dg/cpp1y/vla11.C  -std=c++14 execution test