8048721: -XX:+PrintCompilation prints negative bci for non entrant OSR methods

Removed 'InvalidOSREntryBci' and checking nmethod::_state instead to determine if an osr method is non-entrant.

Reviewed-by: kvn, vlivanov, drchase

hotspot/src/share/vm/code/nmethod.cpp

@@ -1364,8 +1364,6 @@ void nmethod::invalidate_osr_method() {
   // Remove from list of active nmethods
   if (method() != NULL)
     method()->method_holder()->remove_osr_nmethod(this);
-  // Set entry as invalid
-  _entry_bci = InvalidOSREntryBci;
 }
 
 void nmethod::log_state_change() const {