RFR: 8329416: Split relocation pointer map into read-write and read-only maps [v2]

[Matias Saavedra Silva]

> The pointer relocation bitmap is already subdivided into read-write and read-only regions and can be split into two distinct bitmaps. By separating the maps, each sub-map can be further optimized. Verified with tier 1-5 tests.

Matias Saavedra Silva has updated the pull request incrementally with one additional commit since the last revision:

  Ioi comments and cleanup

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18608/files
  - new: https://git.openjdk.org/jdk/pull/18608/files/0f411226..de89b0aa

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18608&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18608&range=00-01

  Stats: 34 lines in 5 files changed: 10 ins; 15 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/18608.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18608/head:pull/18608

PR: https://git.openjdk.org/jdk/pull/18608