Use specific resource indices of MVKShaderStageResourceBinding
when assigning indices to argument buffer elements.
MVKShaderStageResourceBinding expand elements to uint32_t
to support larger numbers of resource arguments.
Fix calculation of descriptor set Metal argument buffer size requirements.
Streamline MVKResourcesCommandEncoderState::encodeToMetalArgumentBuffer(),
and add fix for GPU capturing of Metal arg buffers for Xcode 12.
Update MSLResourceBinding::outMTLTextureType and outIsUsedByShader from shader
only if resource binding is for the correct shader stage, to allow outIsUsedByShader
to be carried across multiple-stage shader compilations.
Remove MVKDescriptorSet::populateMetalArgumentBufferBinding().
Remove MVKSamplerDescriptorMixin::getMetalArgumentBufferSamplerIndexOffset().
Add MVKCommandEncoderState::getDevice().
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