RFR: 8250961: Move Universe::update_heap_info_at_gc to CollectedHeap

[Stefan Karlsson]

On Sun, 6 Sep 2020 07:00:36 GMT, Aditya Mandaleeka <adityam at openjdk.org> wrote:

> This is a small refactoring that moves `update_heap_info_at_gc()` and related members to `CollectedHeap`. There should
> be no behavioral change.
> jdk/hotspot tier1 passed
> 
> JBS: https://bugs.openjdk.java.net/browse/JDK-8250961

Now that the variables and functions have moved to CollectedHeap, I don't think we need the _heap_ infix anymore.

Maybe rename variables to be named:
_capacity_at_last_gc
_used_at_last_gc

Functions:
free_at_last_gc()
used_at_last_gc()
update_capacity_and_used_at_gc()

src/hotspot/share/gc/shared/collectedHeap.hpp line 524:

> 522:   size_t get_heap_used_at_last_gc()    { return _heap_used_at_last_gc; }
> 523:   void update_heap_info_at_gc();
> 524:

Maybe move these to after unused(). Alternatively, move it near soft_ref_policy(), since this is currently only used by
soft ref handling.

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PR: https://git.openjdk.java.net/jdk/pull/27