rvm: switch binary serialization to postcard #358

Job	Run time
Analyze (java-kotlin)	3m 25s
Analyze (javascript-typescript)	4m 35s
Analyze (csharp)	4m 25s
Analyze (go)	4m 14s
Analyze (c-cpp)	11m 24s
Analyze (python)	1m 25s
Analyze (rust)	6m 34s
	36m 2s

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