const golang.org/x/sys/unix.PERF_SAMPLE_BRANCH_COUNTERS

one use

	golang.org/x/sys/unix (current package)
		ztypes_linux.go#L1213: 	PERF_SAMPLE_BRANCH_COUNTERS           = 0x80000

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)