RFR: 8329416: Split relocation pointer map into read-write and read-only maps [v3]

[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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 10 additional commits since the last revision:

 - Fixed for dynamic dump
 - Merge branch 'master' into split_ptrmap_8329416
 - Ioi comments and cleanup
 - Removed debugging code
 - Merge branch 'master' into split_ptrmap_8329416
 - Corrected ro bitmap size and start
 - Two maps at runtime
 - Rw and Ro bitmaps read as a single bitmap at runtime
 - Removed debugging code
 - Split relocation pointer map into read-write and read-only maps

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18608/files
  - new: https://git.openjdk.org/jdk/pull/18608/files/de89b0aa..c6c805f6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18608&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18608&range=01-02

  Stats: 11930 lines in 307 files changed: 7021 ins; 3360 del; 1549 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