RFR (S) 8248240: Remove extendedPC.hpp and fetch_frame_from_ucontext

[David Holmes]

Hi Coleen,

This cleanup looks good - thanks.

My only query (from existing code) is why something called "fetch_frame" 
doesn't actually return a frame ??

Thanks,
David

On 25/06/2020 7:08 am, coleen.phillimore at oracle.com wrote:
> Summary: This empty interface was left over from deleting code from 
> before safepoint polling.
> 
> See bug for details.  Ran tier1-3, and also builds on ppc, aarch64, arm, 
> s390, and zero.
> 
> open webrev at http://cr.openjdk.java.net/~coleenp/2020/8248240.01/webrev
> bug link https://bugs.openjdk.java.net/browse/JDK-8248240
> 
> Thanks,
> Coleen