Add description to Error raised by the server hang watchdog. (#4714)

patches/minecraft/net/minecraft/server/dedicated/ServerHangWatchdog.java.patch

@@ -8,7 +8,7 @@
  
      public ServerHangWatchdog(DedicatedServer p_i46310_1_)
      {
-@@ -37,7 +38,7 @@
+@@ -37,14 +38,14 @@
              long j = MinecraftServer.func_130071_aq();
              long k = j - i;
  
@@ -17,6 +17,14 @@
              {
                  field_180251_a.fatal("A single server tick took {} seconds (should be max {})", String.format("%.2f", (float)k / 1000.0F), String.format("%.2f", 0.05F));
                  field_180251_a.fatal("Considering it to be crashed, server will forcibly shutdown.");
+                 ThreadMXBean threadmxbean = ManagementFactory.getThreadMXBean();
+                 ThreadInfo[] athreadinfo = threadmxbean.dumpAllThreads(true, true);
+                 StringBuilder stringbuilder = new StringBuilder();
+-                Error error = new Error();
++                Error error = new Error(String.format("ServerHangWatchdog detected that a single server tick took %.2f seconds (should be max 0.05)", k / 1000F)); // Forge: don't just make a crash report with a seemingly-inexplicable Error
+ 
+                 for (ThreadInfo threadinfo : athreadinfo)
+                 {
 @@ -75,6 +76,8 @@
                  this.func_180248_a();
              }