SPIR-V: Disallow Float16/Float64 if unsupported.

[maleadt]

No description provided.

[codecov]

Codecov Report

Patch coverage: 94.11% and project coverage change: +0.27 🎉

Comparison is base (341e2e8) 86.82% compared to head (993aca8) 87.10%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #429      +/-   ##
==========================================
+ Coverage   86.82%   87.10%   +0.27%     
==========================================
  Files          24       24              
  Lines        2930     2939       +9     
==========================================
+ Hits         2544     2560      +16     
+ Misses        386      379       -7     

Impacted Files	Coverage Δ
src/metal.jl	86.16% <0.00%> (+1.54%)	⬆️
src/spirv.jl	91.13% <100.00%> (+0.47%)	⬆️
src/validation.jl	97.46% <100.00%> (+0.13%)	⬆️

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