Request for review: JDK-8012052: java/lang/invoke/6987555/Test6987555.java crashes with assert(mcs != NULL) failed: MethodCounters cannot be NULL

[Jiangli Zhou]

Please review the following fix for JDK-8012052 
<https://jbs.oracle.com/bugs/browse/JDK-8012052>:

   http://cr.openjdk.java.net/~jiangli/8012052/webrev.00/

The MethodCounters object is not guaranteed to be present for a method 
that is being compiled when NonTieredCompPolicy::delay_compilation() is 
called due to compiler shuts off. In 
java/lang/invoke/6987555/Test6987555 test case, the current method being 
compiled is java.lang.invoke.MethodHandle::linkToStatic(LL), which 
hasn't been executed before and has no associated MethodCounters at the 
time. Since delay_compilation() decrements the _counter by dividing 2 
only if _counter >0, there is no need to call delay_compilation() when 
the method has no associated MethodCounters.

Thanks,
Jiangli
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