Regressions on master at commit r11-7446 vs commit r11-7431 on Linux/i686

[H.J. Lu]

New failures:

New passes:
FAIL: g++.dg/ext/attr-lambda3.C  -std=c++14 (test for excess errors)
FAIL: g++.dg/ext/attr-lambda3.C  -std=c++17 (test for excess errors)
FAIL: g++.dg/ext/attr-lambda3.C  -std=c++2a (test for excess errors)