also take kills into account when computing flow dependences for C target
also take kills into account when computing flow dependences for C target

Since commit fa76a1b8 (take kills into account when computing flow dependences,
Thu Jan 1 10:14:18 2015 +0100), kills are taken into account, but only
for GPU targets.  However, the reasons for taking kills into account
are not specific for GPU targets, so do it for the C target too.

Signed-off-by: Sven Verdoolaege <235c10dd23b819f81cdc9756a251746bc184cab6@gmail.com>

nicolasvasilache/ppcg,Meinersbur/ppcg,Meinersbur/ppcg,nicolasvasilache/ppcg