RFR: 8275886: G1: remove obsolete comment in HeapRegion::setup_heap_region_size

Mon Oct 25 18:38:15 UTC 2021

Trivial change of removing obsolete comment.

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Commit messages:
 - comment

Changes: https://git.openjdk.java.net/jdk/pull/6113/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6113&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275886
  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6113.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6113/head:pull/6113

PR: https://git.openjdk.java.net/jdk/pull/6113