RFR: Fix build failures due to undeclared ShenandoahOldHeuristics

[Zhengyu Gu]

On Mon, 3 May 2021 11:35:58 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Some configs, notably Zero, does not build due to:
> 
> 
> * For target hotspot_variant-zero_libjvm_objs_shenandoahAdaptiveHeuristics.o:
> In file included from /home/buildbot/worker/build-shenandoah-jdkX-linux/build/src/hotspot/share/gc/shenandoah/heuristics/shenandoahAdaptiveHeuristics.hpp:28:0,
>                  from /home/buildbot/worker/build-shenandoah-jdkX-linux/build/src/hotspot/share/gc/shenandoah/heuristics/shenandoahAdaptiveHeuristics.cpp:27:

Looks good.

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Marked as reviewed by zgu (Committer).

PR: https://git.openjdk.java.net/shenandoah/pull/34