LT22418: take flle not found; use High Process Priority

Change-Id: I0532a514fa679d7ea9177d6242f65af13e4b4176

Author: AndyBlack

Src/Utilities/pcpatrflex/DisambiguateInFLExDB/PCPatrInvoker.cs

@@ -90,6 +90,7 @@ public void Invoke()
 
 			using (var process = Process.Start(processInfo))
 			{
+				process.PriorityClass = ProcessPriorityClass.High;
 				Console.WriteLine("\nBefore WaitForExit");
 				process.WaitForExit();
 				Console.WriteLine("\tAfter  WaitForExit");