[gomp4, committed] Add pass_dce in oacc kernels pass group

[Tom de Vries]

Hi,

now that I've moved insertion of the IFN_GOACC_DIM_POS call to parloops 
( https://gcc.gnu.org/ml/gcc-patches/2015-11/msg00847.html ) , there's 
no need anymore for the dead_load_p hack in parloops.

This patch adds a pass_dce invocation in the kernels pass group.

Committed to gomp-4_0-branch.

Thanks,
- Tom
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