Regressions on trunk at revision 272691 vs revision 272660

[H.J. Lu]

New failures:
FAIL: g++.dg/torture/pr34850.C   -O2 -flto -fno-use-linker-plugin -flto-partition=none  (test for excess errors)
FAIL: g++.dg/torture/pr34850.C   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  (test for excess errors)
FAIL: g++.dg/torture/pr34850.C   -O2  (test for excess errors)
FAIL: g++.dg/torture/pr34850.C   -O3 -g  (test for excess errors)
FAIL: g++.dg/torture/pr34850.C   -Os  (test for excess errors)

New passes: