RFR: 8290291: G1: Merge multiple calls of block_size in HeapRegion::block_start

[Albert Mingkun Yang]

On Thu, 14 Jul 2022 08:55:47 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple change of merging duplicate inline calls. It reduces asm footprint, e.g. `G1RemSet::refine_card_concurrently` by ~200 bytes.
> 
> (The first commit is what I had originally -- inlining the block-walking logic, because block-walking logic is not used by others and highly specific to its sole caller. Ofc, this is subjective.)
> 
> Test: hotspot_gc

Thanks for the review.

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PR: https://git.openjdk.org/jdk/pull/9490