RFR: 8240751: Shenandoah: fold ShenandoahTracer definition [v2]

[Zhengyu Gu]

On Mon, 7 Sep 2020 13:49:03 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Currently, we have `shenandoahTracer.hpp` with a sole definition:
>> class ShenandoahTracer : public GCTracer {
>> public:
>>   ShenandoahTracer() : GCTracer(Shenandoah) {}
>> };
>> 
>> This can be folded near the only use at `shenandoahCollectorPolicy.hpp`.
>
> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Leftover include of deleted file

Marked as reviewed by zgu (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/55