Regressions on trunk at revision 232023 vs revision 232017

[Bill Seurer]

New failures:
FAIL: g++.dg/warn/overflow-warn-1.C  -std=gnu++11  (test for warnings, line 15)
FAIL: g++.dg/warn/overflow-warn-1.C  -std=gnu++11 (test for excess errors)

New passes:
FAIL: runtime/pprof