RFR: 8253938: ZGC: Clean up argument names after JDK-8253030

[Per Liden]

On Fri, 2 Oct 2020 15:47:38 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Lgtm and trivial to me.
>
> Maybe it makes sense to use microseconds in the destructor of `ZMarkTimeout` as well, now that all times in this file
> are converting from ms to us.
>     log_debug(gc, marking)("Mark With Timeout (%s): %s, " UINT64_FORMAT " oops, %.3fms",
>                            ZThread::name(), _expired ? "Expired" : "Completed",
>                            _check_count, TimeHelper::counter_to_millis(duration.value()));

@albertnetymk We print all times in milliseconds (with three decimals) in ZGC, and I think we should continue to do
that here too.

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PR: https://git.openjdk.java.net/jdk/pull/483