Deadlock detection mechanism incorrectly assumes that thread cannot block itself

[Dmytro Sheyko]

Hi,

One more patch regarding deadlock detection.
https://bugs.openjdk.java.net/show_bug.cgi?id=100059

Deadlock detection mechanism assumes that thread cannot block itself. In general this is not right, especially in case of non-reentrant mutexes. One of such examples we can find here (FIFOMutex sample):
http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/locks/LockSupport.html

To fix this, we just need to drop unnecessary code.

Attached updated patch and testcase

Thanks,
Dmytro
 		 	   		  
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