ModGC

Use ALWAYS_INLINE for vm_getinstancevariable #109

Job	Run time
check (mmtk, release, macos-latest)	10m 26s
check (default, ubuntu-latest)	7m 40s
check (default, macos-latest)	7m 56s
check (mmtk, release, ubuntu-latest)	9m 31s
	35m 33s

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