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

[Roland Westrelin]

Thanks for the review, Vladimir.

Roland.

> Looks good.
> 
> Vladimir
> 
> On 11/18/13 12:51 PM, Roland Westrelin 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.
>>