Speed up RWC IO playback by removing unfound files from resolution candidates

Author: RyanCavanaugh

src/harness/loggedIO.ts

@@ -122,6 +122,8 @@ module Playback {
         };
         wrapper.startReplayFromData = log => {
             replayLog = log;
+            // Remove non-found files from the log (shouldn't really need them, but we still record them for diganostic purposes)
+            replayLog.filesRead = replayLog.filesRead.filter(f => f.result.contents !== undefined);
         };
 
         wrapper.endReplay = () => {