Use the default zeros and ones for the POCL back-end - #795
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The POCL back-end filled new arrays with a kernel that took the element type as an
argument. GPUCompiler cannot compile a kernel with a `Type{T}` argument when `T` is a
bits union such as `Union{Missing, Bool}`, so `zeros` and `ones` of such types threw.
POCL arrays are host `Array`s, so the generic `allocate` + `fill!` fallbacks in
KernelInterface work for them and handle bits unions.
Fixes #791
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## main #795 +/- ##
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- Coverage 66.88% 66.66% -0.22%
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Fixes #791.
The POCL back-end filled new arrays with
init_kernel(arr, f, ::Type{T}). On Julia 1.13 and earlier, GPUCompiler'scheck_invocationcannot handle aType{T}argument whenThas no unique representation, which includes bits unions such asUnion{Missing, Bool}. It callsfieldcounton it, which throws, sozerosandonesof those types failed. Julia master is not affected, because GPUCompiler turnsType{T}into aCore.TypeEgal{T}ghost argument there.POCL arrays are plain host
Arrays, so KernelInterface's genericallocate+fill!fallback works for them and handles bits unions. This PR removes the POCL overrides and theinit_kernelthey used. It also adds a POCL-only regression test. The test is kept out of the shared testsuite, because not every back-end supports bits-union arrays (OpenCL.jl'sCLArrayrejects them).release-0.9is not affected. It has no POCL back-end, and its nativeCPU()back-end runsinit_kernelwithout GPUCompiler.Once this is merged, JuliaGPU/AcceleratedKernels.jl#133's skip of the bits-union tests on this back-end can be removed.