MVKPipeline track descriptors used by shaders.
Update resources as dirty at start of Metal render pass or compute encoder.
Add MVKCommandEncoder::beginMetalComputeEncoding() to mark a new Metal compute encoder.
MVKResourcesCommandEncoderState track resource usage that needs to be encoded.
Add MVKResourcesCommandEncoderState::encodeArgumentBufferResourceUsage().
Add MVKCommandEncoderState::beginMetalComputeEncoding() to mark compute
state dirty when a MTLComputeEncoder is created.
Add SPIRVToMSLConversionConfiguration::isResourceUsed().
MVKBitArray add ability to retain contents when resizing, and clear bit during getBit().
Add MVKBitArray getBit() option to clear bit.
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