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

one use

	golang.org/x/sys/unix (current package)
		ztypes_linux.go#L1104: 	PerfBitEnableOnExec                  = CBitFieldMaskBit12

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