RFR: 8315550: G1: Fix -Wconversion warnings in g1NUMA

Fri Sep 1 15:55:02 UTC 2023

Simple `int` to `uint` for NUMA node-id.

Possibly, `numa_get_leaf_groups` should accept `uint[]`. I will attempt that in another PR, as that will be mostly runtime, not G1 specific.

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Commit messages:
 - g1-numa

Changes: https://git.openjdk.org/jdk/pull/15541/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15541&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315550
  Stats: 32 lines in 8 files changed: 0 ins; 1 del; 31 mod
  Patch: https://git.openjdk.org/jdk/pull/15541.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15541/head:pull/15541

PR: https://git.openjdk.org/jdk/pull/15541