RFR: 8357976: GenShen crash in swap_card_tables: Should be clean [v3]

[William Kemper]

> Degenerated cycles must also clean the `read` card table before swapping it with the `write` card table.

William Kemper has updated the pull request incrementally with one additional commit since the last revision:

  Revert "Consolidate read table cleaning"
  
  This reverts commit 9552021cbeec699e7b04db81fa68819c23b7dab7.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25735/files
  - new: https://git.openjdk.org/jdk/pull/25735/files/9552021c..a313cf8d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25735&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25735&range=01-02

  Stats: 20 lines in 3 files changed: 10 ins; 5 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/25735.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25735/head:pull/25735

PR: https://git.openjdk.org/jdk/pull/25735