prow/tide/tide.go
func poolPRMap(subpoolMap map[string]*subpool) map[string]PullRequest {
	prs := make(map[string]PullRequest)
	for _, sp := range subpoolMap {
		for _, pr := range sp.prs {
			prs[prKey(&pr)] = pr
		}
	}
	return prs
}
func poolPRMap(subpoolMap map[string]*subpool) map[string]PullRequest {
	prs := make(map[string]PullRequest)
	for _, sp := range subpoolMap {
		for _, pr := range sp.prs {
			prs[prKey(&pr)] = pr
		}
	}
	return prs
}
// poolPRMap collects all subpool PRs into a map containing all pooled PRs.