Deal with GC preserve stacks #601

Job	Run time
binding-tests (Immix, Default) / build-debug	50m 20s
binding-tests (Immix, Default) / build-test-other	3h 5m 47s
binding-tests (Immix, Default) / build-test-LinearAlgebra	2h 2m 4s
binding-tests (Immix, Default) / build-test-stdlib	1h 20m 19s
binding-tests (Immix, Non_Moving) / build-debug	48m 17s
binding-tests (Immix, Non_Moving) / build-test-LinearAlgebra	2h 18m 53s
binding-tests (Immix, Non_Moving) / build-test-other	3h 10m 59s
binding-tests (Immix, Non_Moving) / build-test-stdlib	1h 15m 50s
binding-tests (StickyImmix, Default) / build-debug	37m 29s
binding-tests (StickyImmix, Default) / build-test-other	2h 59m 26s
binding-tests (StickyImmix, Default) / build-test-LinearAlgebra	1h 57m 7s
binding-tests (StickyImmix, Default) / build-test-stdlib	1h 18m 40s
binding-tests (StickyImmix, Non_Moving) / build-debug	36m 26s
binding-tests (StickyImmix, Non_Moving) / build-test-LinearAlgebra	2h 6m 23s
binding-tests (StickyImmix, Non_Moving) / build-test-other	3h 3m 56s
binding-tests (StickyImmix, Non_Moving) / build-test-stdlib	1h 17m 19s
	1d 4h 49m 15s

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