Regressions on trunk at revision 174952 vs revision 174893

[Kirill Yukhin [Intel64 Core i7 AVX]]

New failures:
FAIL: g++.dg/torture/pr40389.C  -O2 -flto  execution test
FAIL: g++.dg/torture/pr40389.C  -O2 -flto -flto-partition=none  execution test
FAIL: g++.dg/torture/pr43879-1_1.C  -O1  execution test
FAIL: g++.dg/torture/pr43879-1_1.C  -O1  execution test
FAIL: g++.dg/torture/pr43879-1_1.C  -O2  execution test
FAIL: g++.dg/torture/pr43879-1_1.C  -O2  execution test
FAIL: g++.dg/torture/pr43879-1_1.C  -O3 -fomit-frame-pointer  execution test
FAIL: g++.dg/torture/pr43879-1_1.C  -O3 -fomit-frame-pointer  execution test
FAIL: g++.dg/torture/pr43879-1_1.C  -O3 -g  execution test
FAIL: g++.dg/torture/pr43879-1_1.C  -O3 -g  execution test
FAIL: g++.dg/torture/pr43879-1_1.C  -Os  execution test
FAIL: g++.dg/torture/pr43879-1_1.C  -Os  execution test
FAIL: gcc.dg/torture/tls/run-ld.c  -O1  -pie -fPIE  execution test
FAIL: gcc.dg/torture/tls/run-ld.c  -O1  -pie -fpie  execution test
FAIL: gcc.dg/torture/tls/run-ld.c  -O2  -pie -fPIE  execution test
FAIL: gcc.dg/torture/tls/run-ld.c  -O2  -pie -fpie  execution test
FAIL: gcc.dg/torture/tls/run-ld.c  -O3 -fomit-frame-pointer  -pie -fPIE  execution test
FAIL: gcc.dg/torture/tls/run-ld.c  -O3 -fomit-frame-pointer  -pie -fpie  execution test
FAIL: gcc.dg/torture/tls/run-ld.c  -O3 -g  -pie -fPIE  execution test
FAIL: gcc.dg/torture/tls/run-ld.c  -O3 -g  -pie -fpie  execution test
FAIL: gcc.dg/torture/tls/run-ld.c  -Os  -pie -fPIE  execution test
FAIL: gcc.dg/torture/tls/run-ld.c  -Os  -pie -fpie  execution test

New passes:
FAIL: gcc.dg/dump-pass.c (test for excess errors)
FAIL: gcc.dg/dump-pass.c (test for excess errors)