Regressions on trunk at revision 263672 vs revision 263646

[H.J. Lu (Intel64)]

New failures:
FAIL: gcc.dg/guality/pr41616-1.c   -O2  -DPREVENT_OPTIMIZATION  execution test
FAIL: gcc.dg/guality/pr41616-1.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  -DPREVENT_OPTIMIZATION execution test

New passes:
FAIL: c-c++-common/torture/builtin-arith-overflow-17.c   -O0  execution test
FAIL: c-c++-common/torture/builtin-arith-overflow-17.c   -O0  execution test
FAIL: c-c++-common/torture/builtin-arith-overflow-17.c   -O2  execution test
FAIL: c-c++-common/torture/builtin-arith-overflow-17.c   -O2  execution test
FAIL: c-c++-common/torture/builtin-arith-overflow-17.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  execution test
FAIL: c-c++-common/torture/builtin-arith-overflow-17.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  execution test
FAIL: c-c++-common/torture/builtin-arith-overflow-p-17.c   -O0  execution test
FAIL: c-c++-common/torture/builtin-arith-overflow-p-17.c   -O0  execution test
FAIL: c-c++-common/torture/builtin-arith-overflow-p-17.c   -O2  execution test
FAIL: c-c++-common/torture/builtin-arith-overflow-p-17.c   -O2  execution test
FAIL: c-c++-common/torture/builtin-arith-overflow-p-17.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  execution test
FAIL: c-c++-common/torture/builtin-arith-overflow-p-17.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  execution test
FAIL: gcc.dg/guality/vla-1.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  -DPREVENT_OPTIMIZATION line 24 sizeof (a) == 17 * sizeof (short)
FAIL: gcc.dg/guality/vla-1.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  -DPREVENT_OPTIMIZATION line 24 sizeof (a) == 17 * sizeof (short)
FAIL: gcc.dg/guality/vla-1.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  -DPREVENT_OPTIMIZATION line 24 sizeof (a) == 17 * sizeof (short)
FAIL: gcc.dg/guality/vla-1.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  -DPREVENT_OPTIMIZATION line 24 sizeof (a) == 17 * sizeof (short)
FAIL: gcc.target/i386/20040112-1.c scan-assembler testb