Metal: Support vector-valued intrinsics.

[maleadt]

Julia emits these on 1.10 when doing CartesianIndices operations:

julia> fill!(view(MtlArray{Float32}(undef, 2, 2), 2:2, 2:2), 0)
ERROR: Unsupported intrinsic type: LLVM.VectorType(<2 x i64>)
Stacktrace:
  [1] error(s::String)
    @ Base ./error.jl:35
  [2] lower_llvm_intrinsics!(job::GPUCompiler.CompilerJob, fun::LLVM.Function)
    @ GPUCompiler ~/Julia/pkg/GPUCompiler/src/metal.jl:893
  [3] finish_ir!(job::GPUCompiler.CompilerJob{GPUCompiler.MetalCompilerTarget}, mod::LLVM.Module, entry::LLVM.Function)
    @ GPUCompiler ~/Julia/pkg/GPUCompiler/src/metal.jl:129

[codecov]

Codecov Report

Patch coverage: 69.23% and project coverage change: +1.35% 🎉

Comparison is base (947507e) 82.82% compared to head (d4f513c) 84.17%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #515      +/-   ##
==========================================
+ Coverage   82.82%   84.17%   +1.35%     
==========================================
  Files          24       24              
  Lines        3289     3292       +3     
==========================================
+ Hits         2724     2771      +47     
+ Misses        565      521      -44     

Files Changed	Coverage Δ
src/metal.jl	72.57% <69.23%> (+4.84%)	⬆️

... and 2 files with indirect coverage changes

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