Regressions on trunk at revision 266733 vs revision 266708

[H.J. Lu (Intel64 Core i7)]

New failures:
FAIL: g++.dg/cpp1y/lambda-generic-83856.C  -std=c++14 (test for excess errors)
FAIL: g++.dg/cpp1y/lambda-generic-83856.C  -std=c++17 (test for excess errors)

New passes:
FAIL: gcc.dg/predict-22.c scan-tree-dump-times optimized "count 0," 1
FAIL: gcc.dg/predict-22.c scan-tree-dump-times optimized "count 0," 1