RFR: 8338479: GenShen: Detemplatize ShenandoahScanRemembered [v3]

[Y. Srinivas Ramakrishna]

> De-templatize ShenandoahScanRemembered and ShenandoahCardCluster, based on Roman's review feedback at https://github.com/openjdk/jdk/pull/20395/files/46638cdef26fd25c290e6f63035ff5d2f1dc3bdb#r1718773835.
> 
> 
> **Testing:**
> 
> - [x] GHA
> - [x] jtreg:tier1
> - [ ] codepipeline
> - [ ] SPECjbb

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

  Leave get_card_table_byte_map() also inline like it was before; required
  moving definition into the hpp file as it was used by the tempated
  methods that needed it in multiple translation units presumably.

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Changes:
  - all: https://git.openjdk.org/shenandoah/pull/472/files
  - new: https://git.openjdk.org/shenandoah/pull/472/files/8433b9cd..4ebd404a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=shenandoah&pr=472&range=02
 - incr: https://webrevs.openjdk.org/?repo=shenandoah&pr=472&range=01-02

  Stats: 10 lines in 2 files changed: 3 ins; 6 del; 1 mod
  Patch: https://git.openjdk.org/shenandoah/pull/472.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah.git pull/472/head:pull/472

PR: https://git.openjdk.org/shenandoah/pull/472