ModGC

ZJIT: Write JITFrame pointer for C frames #2602

Job	Run time
check (mmtk, release, macos-latest)	11m 23s
check (mmtk, release, ubuntu-latest)	11m 58s
check (default, macos-latest)	7m 44s
check (default, ubuntu-latest)	7m 28s
	38m 33s

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