Regressions on trunk at revision 155169 vs revision 155159

[H.J. Lu ia32]

New failures:

New passes:
FAIL: g++.dg/lto/20081109 cp_lto_20081109_0.o-cp_lto_20081109_1.o execute -O2 -fwhopr
FAIL: gcc.dg/torture/builtin-math-7.c  -O2 -flto  execution test
FAIL: gcc.dg/torture/builtin-math-7.c  -O2 -fwhopr  execution test