Emscripten build

Add WeakValueHashMap class #3618

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Run time

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Job	Run time
Win10 -> Emscripten, Release	23m 4s
Win10 -> Emscripten, Debug	20m 47s
Linux -> Emscripten, Release	18m 38s
MacOS -> Emscripten, Debug	15m 51s
Linux -> Emscripten, Debug	15m 43s
	1h 34m 3s