Optimization and synchronization

[Roland.Hautz]

Hello,

a short question: do you want this PR under category java or optimization? 
Or doesn't that matter?

class Test1 {
  Object barrier;
  Object table;
  void test() {
        Object tab = table;
        if (tab == null) {
            synchronized(barrier) {
                tab = table;
            }
        }
  }  
}

> gcj -O -c Test1.java 
Test1.java: In class `Test1':
Test1.java: In method `Test1.test()':
Test1.java:11: Wrong amount of branch edges after unconditional jump 1
Test1.java:11: verify_flow_info failed


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