RFR: 8220610: Make CollectedHeap nmethod functions pure virtual

[Aleksey Shipilev]

On 3/18/19 4:26 PM, Stefan Karlsson wrote:
> Hi all,
> 
> I suggest that we make all CollectedHeap nmethod functions pure virtual.
> 
> http://cr.openjdk.java.net/~stefank/8220610/webrev.01/

Epsilon changes are trivially fine.

Shenandoah changes look fine. I assume flush_nmethod is only need when GC implementation actually
uses CompiledMethod::gc_data storage attached to nmethod*, and not otherwise?

-Aleksey

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