Fix CQS signal modernize-use-emplace in fbcode/cachelib/navy

Differential Revision: D111007926

fbshipit-source-id: e088279a8906f69f87ad01de59af77e4153c69bd

Author: generatedunixname1587093422349604

cachelib/navy/block_cache/RegionManager.cpp

@@ -636,7 +636,7 @@ void RegionManager::restoreUntrackedRegions(
     }
     if (regions_[i]->getNumItems() == 0 &&
         cleanRegions_.size() < numCleanRegions_) {
-      cleanRegions_.push_back(RegionId{i});
+      cleanRegions_.emplace_back(i);
     } else {
       track(RegionId{i});
     }