[jdk17u-dev] RFR: 8276129: PretouchTask should page-align the chunk size

[Dmitry Chuyko]

[Tiny] Avoid pretouch chunks overlapping the same page.

Original patch does not apply because of PretouchTask::pretouch parameter renaming (context), the change itself is the same.

Testing: jtreg tier1 & gc (aarch64 build).

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Commit messages:
 - Backport 0e0dd33fff9922a086968cfa6ccd27727f979c83

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/41/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=41&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276129
  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/41.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/41/head:pull/41

PR: https://git.openjdk.java.net/jdk17u-dev/pull/41