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

[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.

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Commit messages:
 - 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

Changes: https://git.openjdk.org/jdk/pull/18608/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18608&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8329416
  Stats: 96 lines in 7 files changed: 80 ins; 1 del; 15 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