internal/loganal: accept inlined frames when parsing tracebacks
internal/loganal: accept inlined frames when parsing tracebacks

This fixes a hang in 'greplogs -E .' when parsing
https://build.golang.org/log/7d2fead21f578d17f75e3d0523c53e7a86411dbb,
which contains an inlined entry for 'runtime.(*_type).nameOff':

	runtime.(*_type).nameOff(...)
		/workdir/go/src/runtime/type.go:219

aclements/go-misc,aclements/go-misc,aclements/go-misc,aclements/go-misc,aclements/go-misc