ModGC

ZJIT: LIR CCall survivors: Use one stack layout across arches #2779

Job	Run time
check (mmtk, release, ubuntu-latest)	12m 8s
check (mmtk, release, macos-latest)	9m 12s
check (default, macos-latest)	7m 25s
check (default, ubuntu-latest)	7m 30s
	36m 15s

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