Regressions on trunk at revision 199576 vs revision 199557

[H.J. Lu x32]

New failures:

New passes:
FAIL: gfortran.dg/power_6.f90  -O   scan-tree-dump optimized "powi_[0-9] = powi_cond_[0-9] \\? -1.0e\\+0 : 1.0e\\+0;"
FAIL: gfortran.dg/power_6.f90  -O   scan-tree-dump optimized "powi_cond_[0-9] = k_[0-9]\\(D\\) & 1;"
FAIL: gfortran.dg/power_6.f90  -O   scan-tree-dump-not optimized "__builtin_powif"