Regressions on trunk at revision 186649 vs revision 186559

[Kirill Yukhin [Intel64 Core i7 AVX]]

New failures:
FAIL: 25_algorithms/stable_partition/mem_check.cc execution test
FAIL: 25_algorithms/stable_partition/mem_check.cc execution test
FAIL: 25_algorithms/stable_sort/mem_check.cc execution test
FAIL: 25_algorithms/stable_sort/mem_check.cc execution test
FAIL: gcc.dg/pr52283.c (test for excess errors)
FAIL: gcc.dg/pr52283.c (test for excess errors)
FAIL: gcc.dg/torture/builtin-explog-1.c  -O0  (test for excess errors)
FAIL: gcc.dg/torture/builtin-explog-1.c  -O0  (test for excess errors)
FAIL: gcc.dg/torture/builtin-power-1.c  -O0  (test for excess errors)
FAIL: gcc.dg/torture/builtin-power-1.c  -O0  (test for excess errors)

New passes: