Tobias Grosser 4eaedde530 GPGPU: Use a tile size of 32 by default ...

The tile size was previously uninitialized. As a result, it was often zero (aka.
no tiling), which is not what we want in general. More importantly, there was
the risk for arbitrary tile sizes to be choosen, which we did not observe, but
which still is highly problematic.

llvm-svn: 275418

2016-07-14 14:14:02 +00:00

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