pragma unroll syntax

[jeffhammond]

Intel and IBM compilers want parentheses around the unrolling factor, while OpenCL and NVIDIA do not. It's pretty easy to handle this along the lines of https://github.com/jeffhammond/nwchem-tce-triples-kernels/blob/master/src/pragma_vendor.h. If you want a pull request, I'll try to work on it.

neighbor.cpp(361): warning #125: expected a "("
            #pragma unroll 8

neighbor.cpp(278): warning #125: expected a "("
      #pragma unroll 4

References

• Intel
• IBM
• OpenCL
• NVIDIA