RFR: 8337981: ShenandoahHeap::is_in should check for alive regions [v2]

[Aleksey Shipilev]

On Wed, 14 Aug 2024 16:40:13 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> Not sure I understand. The if-condition checks that we are pointing into heap. This means `heap_region_containing` always returns the region.
>
> heap_region_containing() returns the region for which bottom <= p < end, my question is if we should check if bottom <= p < top, in other words if p is within the region's currently allocated part (as opposed to the unallocated tail, if any).

Right, we should check that as well. Done in new commit, but I have to re-run the tests now, because something might trigger on this.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20492#discussion_r1717345515