Regressions on 5 at revision 231162 vs revision 230867

[Bill Seurer]

New failures:
FAIL: g++.dg/cpp1y/vla-initlist1.C  -std=gnu++11 execution test
FAIL: g++.dg/cpp1y/vla-initlist1.C  -std=gnu++14 execution test
FAIL: gcc.dg/tree-ssa/ivopts-lt-2.c scan-tree-dump-times ivopts "PHI" 1
FAIL: gcc.dg/tree-ssa/ivopts-lt-2.c scan-tree-dump-times ivopts "p_[0-9]* <" 1
FAIL: runtime

New passes:
FAIL: gcc.dg/tree-ssa/ivopts-lt-2.c scan-tree-dump-times ivopts "p_[0-9]* <" 1
FAIL: gcc.dg/tree-ssa/ivopts-lt-2.c scan-tree-dump-times ivopts "PHI" 1
FAIL: g++.dg/cpp1y/vla-initlist1.C  -std=gnu++11 execution test
FAIL: g++.dg/cpp1y/vla-initlist1.C  -std=gnu++14 execution test
UNRESOLVED: libstdc++-prettyprinters/debug.cc compilation failed to produce executable
UNRESOLVED: libstdc++-prettyprinters/simple.cc compilation failed to produce executable