RFR: 8278396: G1: Initialize the BOT threshold to be region bottom

[Stefan Johansson]

On Wed, 8 Dec 2021 09:43:06 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> This simple patch tightens the assert for offset card value and drops the special treatment of the first card for a region.
> 
> Test: tier1-5

Marked as reviewed by sjohanss (Reviewer).

src/hotspot/share/gc/g1/heapRegion.cpp line 801:

> 799: 
> 800: void HeapRegion::initialize_bot_threshold() {
> 801:   _bot_part.reset_bot();

As a follow-up it might be nice to also rename the function here and update the usage to have matching naming for parameters and such.

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PR: https://git.openjdk.java.net/jdk/pull/6762