Regressions on trunk at revision 231423 vs revision 231405

[Bill Seurer]

New failures:
FAIL: gcc.dg/pr63594-2.c execution test
FAIL: runtime
FAIL: runtime/pprof

New passes:
FAIL: gcc.dg/pr63594-1.c (internal compiler error)
FAIL: gcc.dg/pr63594-1.c (test for excess errors)
FAIL: gcc.dg/pr63594-2.c (internal compiler error)
FAIL: gcc.dg/pr63594-2.c (test for excess errors)
FAIL: gcc.dg/vect/vect-singleton_1.c (internal compiler error)
FAIL: gcc.dg/vect/vect-singleton_1.c (test for excess errors)
FAIL: gcc.dg/vect/vect-singleton_1.c -flto -ffat-lto-objects (internal compiler error)
FAIL: gcc.dg/vect/vect-singleton_1.c -flto -ffat-lto-objects (test for excess errors)
UNRESOLVED: gcc.dg/pr63594-2.c compilation failed to produce executable