RFR: 8296785: Use realloc for CHeap-allocated BitMaps [v2]

[Thomas Stuefe]

On Wed, 16 Nov 2022 16:47:01 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> src/hotspot/share/utilities/bitMap.cpp line 53:
>> 
>>> 51: 
>>> 52:   return map;
>>> 53: }
>> 
>> Could this live inside `GrowableBitmap<T>` as a private static function?
>
> It could, though I see that function as an implementation detail of ArenaBitMap and ResourceBitMap, that I don't want to burden CHeapBitMap with. I also like if we can keep the definition of GrowableBitMap simple, so that it's easier to read and understand. So, I'd prefer to not have to do this. I hope that's OK.

Fine with me.

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PR: https://git.openjdk.org/jdk/pull/11102