RFR: 8347729: Replace SIZE_FORMAT in parallel and serial gc

[Coleen Phillimore]

Please review this change to replace SIZE_FORMAT with %zu in the parallel and serial gc directories. The only hand edit that I did for this one was SIZE_FORMAT_W(7) because my sed script had problems with it.  The %zu is a lot less noisy but it does look funny as %zums.  I verified that this format specifier does print <the number>ms and doesn't get confused.

Tested all the GC changes together (other PRs coming) with tier1-4 on x86 and aarch64.

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Commit messages:
 - Replace SIZE_FORMAT in othergc gc

Changes: https://git.openjdk.org/jdk/pull/23113/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23113&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8347729
  Stats: 122 lines in 17 files changed: 0 ins; 1 del; 121 mod
  Patch: https://git.openjdk.org/jdk/pull/23113.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23113/head:pull/23113

PR: https://git.openjdk.org/jdk/pull/23113