RFR: 8254824: SignalHandlerMark have no purpose

[Robbin Ehn]

On Thu, 15 Oct 2020 09:11:15 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> SignalHandlerMark increase and decrease _num_nested_signal, but it is never read.
>> We have no caller to is_inside_signal_handler().
>> 
>> Testing T1.
>
> Looks fine to me.

Thanks @tstuefe and @shipilev!

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PR: https://git.openjdk.java.net/jdk/pull/677