Add device-side exception reporting.

[maleadt]

Relies on JuliaLLVM/LLVM.jl#516 to avoid errors with the emitted SPIR-V.

cc @vchuravy

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 32.28%. Comparing base (5519c83) to head (5912916).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #328       +/-   ##
===========================================
- Coverage   75.32%   32.28%   -43.04%     
===========================================
  Files          12       11        -1     
  Lines         616      573       -43     
===========================================
- Hits          464      185      -279     
- Misses        152      388      +236     

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[maleadt]

Seems to expose a bug in PoCL:

julia: /home/runner/work/OpenCL.jl/OpenCL.jl/pocl/lib/llvmopencl/WorkitemLoops.cc:284: std::pair<llvm::BasicBlock*, llvm::BasicBlock*> pocl::WorkitemLoopsImpl::createLoopAround(pocl::ParallelRegion&, llvm::BasicBlock*, llvm::BasicBlock*, bool, int, bool, llvm::Value*): Assertion `ExitBB->getTerminator()->getNumSuccessors() == 1' failed.

[maleadt]

Filed as pocl/pocl#1958