Regressions on trunk at revision 179288 vs revision 179274

[H.J. Lu ia32]

New failures:

New passes:
FAIL: gcc.c-torture/execute/builtins/strstr-asm.c compilation,  -O2 -flto 
FAIL: gcc.c-torture/execute/builtins/strstr-asm.c compilation,  -O2 -flto -flto-partition=none