pkg/cover: extract coverage points from binary data for s390x arch #590

Job	Run time
aux	5m 18s
build	1s
dashboard	18h 27m 24s
gvisor	3m 59s
arch (presubmit_arch_linux)	10m 20s
arch (presubmit_arch_netbsd)	3m 54s
arch (presubmit_arch_executor)	3m 21s
arch (presubmit_arch_darwin)	3m 43s
race	1s
arch (presubmit_arch_freebsd)	6m 24s
race_dashboard	1s
arch (presubmit_arch_windows)	3m 37s
arch (presubmit_arch_openbsd)	3m 46s
old	6m 57s
	19h 18m 46s

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