Fix Opencl and LLVM GPU tests

Stephan Seitzrequested to merge
seitz/pystencils:fix-opencl-llvm-gpu into master

Fix tests for LLVM GPU and OpenCL

  • !96 (merged) made it impossible to print functions without names (only important for LLVM GPU test)
  • !87 (merged) made it impossible to run OpenCL kernels on CUDA OpenCL int(...). is not a valid cast for it
  • SymPy moved sympy.boolalg to sympy.logic.boolalg
Edited by Stephan Seitz

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