ModGC

Merge branch 'master' into share-jit-glue #373

Job	Run time
check (default, macos-latest)	4m 49s
check (default, ubuntu-latest)	6m 42s
check (mmtk, release, macos-latest)	6m 13s
check (mmtk, release, ubuntu-latest)	8m 9s
	25m 53s

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