RFR: 8314161: G1: Fix -Wconversion warnings in G1CardSetConfiguration::_bitmap_hash_mask

[Ivan Walulya]

On Fri, 11 Aug 2023 12:24:27 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple type change and updating to use more common mask-initialization.
> 
> Test: hotspot_gc

Marked as reviewed by iwalulya (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15247#pullrequestreview-1586695196