RFR: 8279063: Consolidate push and push_if_necessary in PreservedMarks

[Roman Kennke]

On Tue, 21 Dec 2021 13:27:46 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple change of cleaning up `PreservedMarks` API.
> 
> Test: hotspot_gc

Seems good. One question.

src/hotspot/share/gc/g1/g1FullGCMarker.inline.hpp line 57:

> 55: 
> 56:   // Marked by us, preserve if needed.
> 57:   if (_collector->is_compacting(obj)) {

I wonder if is_compacting() is actually used (returning false) by any collector. Sounds like it might be a left-over from CMS.

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PR: https://git.openjdk.java.net/jdk/pull/6909