Pass VkPipelineBindPoint during descriptor set binding, and hold bound
descriptor sets and dynamic offsets in MVKResourcesCommandEncoderState.
Add MVKDescriptor::encodeToMetalArgumentBuffer() to write descriptor to arg buffer.
MVKInlineUniformBlockDescriptor use temp MTLBuffer, available through
MVKDescriptorPool, so it can be written to arg buffer.
Write to arg buffer during MVKResourcesCommandEncoderState encoding, for update-after-bind.
Add MVKBitArray::enumerateEnabledBits() to perform operations on enabled bits.
During beta period, disable MVKConfiguration::useMetalArgumentBuffers/
MVK_CONFIG_USE_METAL_ARGUMENT_BUFFERS by default.
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