RFR(XS): 8028064: tiered may collect wrong receiver type at virtual call

[Roland Westrelin]

Thanks for the review, Igor.

Roland.

> Looks ok. Thanks for noticing this.
> 
> igor
> 
> On Nov 18, 2013, at 12:51 PM, Roland Westrelin <roland.westrelin at oracle.com> wrote:
> 
>> When there’s a unique possible callee method, tiered optimizes profile collection by using the callee’s holder as unique possible class. That’s incorrect. For instance, with this class hierarchy:
>>   class A {
>>       void m() {}
>>   }
>> 
>>   class B extends A {
>>   }
>> 
>> and this java code:
>> B b
>> b.m();
>> 
>> the callee’s holder is A but profiling should record B. The class itself should be tested as being final or leaf.
>> 
>> http://cr.openjdk.java.net/~roland/8028064/webrev.00/
>> 
>> Roland.
>