RFR: 8325671: Shenandoah: Introduce a ShenandoahGenerationType and templatize certain marking closures with it [v5]

[Y. Srinivas Ramakrishna]

> 8325671: Shenandoah: Introduce a ShenandoahGenerationType and templatize certain marking closures with it

Y. Srinivas Ramakrishna has updated the pull request incrementally with one additional commit since the last revision:

  Changes from review: Adjust order of parms in functions so they are consistent with their
  template parameter order and contiguity, per convention.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17815/files
  - new: https://git.openjdk.org/jdk/pull/17815/files/bce39e40..69070cfd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17815&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17815&range=03-04

  Stats: 21 lines in 4 files changed: 2 ins; 3 del; 16 mod
  Patch: https://git.openjdk.org/jdk/pull/17815.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17815/head:pull/17815

PR: https://git.openjdk.org/jdk/pull/17815