Test

Support interfaces having multiple base interfaces #4686

Job	Run time
Check	6s
Features	20s
Runtimes	32s
Compiler (ubuntu, node current)	2m 8s
Bootstrap (debug)	6m 21s
Coverage	3m 39s
Compiler (ubuntu, node lts/*)	2m 8s
Bootstrap (release)	6m 59s
Loader	22s
Compiler (macos, node current)	2m 54s
Compiler (macos, node lts/*)	2m 49s
Compiler (windows, node current)	2m 24s
Compiler (windows, node lts/*)	2m 40s
	33m 22s

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