RFR: 8322859: Parallel: Move transform_stack_chunk

[Albert Mingkun Yang]

Simple moving the `transform_stack_chunk` call to match its counterpart in G1.

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Commit messages:
 - pgc-stack-chunk

Changes: https://git.openjdk.org/jdk/pull/17227/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17227&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322859
  Stats: 4 lines in 1 file changed: 2 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17227.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17227/head:pull/17227

PR: https://git.openjdk.org/jdk/pull/17227