RFR: 8266740: Shenandoah: Heap region count calculation still wrong after JDK-8265239

[Zhengyu Gu]

On Fri, 7 May 2021 18:09:50 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> JDK-8265239 only addressed heap size that needed to be aligned to region size, it did not address the adjustment needed when use large page.
> 
> To avoid all the complication, I purpose to defer region count calculation until heap size adjustment is done.
> 
> Test:
> - [x] hotspot_gc_shenandoah
> - [x] runtime/os/TestTracePageSizes.java now passed

A duplicate of JDK-8266802

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PR: https://git.openjdk.java.net/jdk/pull/3922