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

[zhengyu123]

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:

• hotspot_gc_shenandoah
• runtime/os/TestTracePageSizes.java now passed

---

Progress

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Issue

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

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[openjdk]

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[mlbridge]

Webrevs

• 00: Full (793a0f65)

[zhengyu123]

A duplicate of JDK-8266802