InvalidIRError when using integer powers

Created by: sandreza

It seems that using integer powers as in 2^11 in a kernel yields an error

MWE: In https://github.com/JuliaGPU/KernelAbstractions.jl/blob/master/examples/matmul.jl#L10 If one instead adds m=2^11 to line 10

@kernel function matmul_kernel!(a, b, c)
    i, j = @index(Global, NTuple)
    m = 2^11
    # creating a temporary sum variable for matrix multiplication
    tmp_sum = zero(eltype(c))
    for k = 1:size(a)[2]
        tmp_sum += a[i,k] * b[k, j]
    end

    c[i,j] = tmp_sum
end

one gets an invalid IRE error:

However, change m = 2^11 to m = Int(2.0^11), as in

@kernel function matmul_kernel!(a, b, c)
  i, j = @index(Global, NTuple)
  m = Int(2.0^11)
  # creating a temporary sum variable for matrix multiplication
  tmp_sum = zero(eltype(c))
  for k = 1:size(a)[2]
      tmp_sum += a[i,k] * b[k, j]
  end

  c[i,j] = tmp_sum
end

yields no error and the test passes.

Perhaps extending https://github.com/JuliaGPU/KernelAbstractions.jl/blob/e08b87dd6e89797afda2c4cf8a0c8ad4941e8a9a/lib/CUDAKernels/src/CUDAKernels.jl#L281-L285 to integers solves the issue?

Platform Info: OS: Linux (x86_64-pc-linux-gnu) CPU: Intel(R) Xeon(R) Silver 4214 CPU @ 2.20GHz WORD_SIZE: 64 LIBM: libopenlibm LLVM: libLLVM-9.0.1 (ORCJIT, cascadelake)

The GPU is a TitanV