Merge pull request #5359 from tonistiigi/gc-free-max-support #1

Job	Run time
build (windows/amd64)	2m 58s
build (freebsd/amd64)	2m 48s
test-freebsd-amd64	2m 51s
test-windows-amd64 (containerd, ./client)	4m 52s
test-windows-amd64 (containerd, ./cmd/buildctl)	2m 45s
test-windows-amd64 (containerd, ./worker/containerd)	3m 7s
test-windows-amd64 (containerd, ./solver)	2m 58s
test-windows-amd64 (containerd, ./frontend)	2m 29s
test-windows-amd64 (containerd, ./frontend/dockerfile)	29m 23s
test-windows-amd64 (./..., 1)	12m 9s
	1h 6m 20s

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