MacOS/iOS/tvOS build

Core: enable DXC on Mac; add Metal mesh shader test reference #1719

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Run time

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Job	Run time
MacOS -> Pre-Checks	47s
MacOS -> tvOS-Debug	6m 51s
MacOS -> MacOS-Release	13m 32s
MacOS -> iOS-Debug	6m 30s
MacOS -> iOS-Release	7m 24s
MacOS -> MacOS-Debug	12m 22s
	47m 26s