Regressions on trunk at revision 205506 vs revision 205504

[H.J. Lu Intel64]

New failures:
FAIL: gcc.c-torture/execute/pr58431.c compilation,  -O1 

New passes:
FAIL: 28_regex/algorithms/regex_replace/wchar_t/51711.cc (test for excess errors)
FAIL: gcc.dg/torture/pr27184.c  -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  execution test
FAIL: gcc.dg/torture/pr27184.c  -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  (test for excess errors)
FAIL: gcc.dg/torture/restrict-5.c  -O2 -flto -fno-use-linker-plugin -flto-partition=none  (test for excess errors)
FAIL: gcc.dg/torture/stackalign/alloca-5.c  -O0  (test for excess errors)
FAIL: gcc.target/i386/avx-vcmpps-256-1.c (test for excess errors)
FAIL: g++.dg/opt/strength-reduce.C -std=gnu++11 (test for excess errors)
FAIL: gfortran.fortran-torture/execute/nestcons.f90 compilation,  -O0 
FAIL: gfortran.fortran-torture/execute/where17.f90 compilation,  -Os