RFR: 8316694: Implement relocation of nmethod within CodeCache

[Chad Rakoczy]

This PR introduces a new function to replace nmethods, addressing [JDK-8316694](https://bugs.openjdk.org/browse/JDK-8316694). It enables the creation of new nmethods from existing ones, allowing method relocation in the code heap and supporting [JDK-8328186](https://bugs.openjdk.org/browse/JDK-8328186).

When an nmethod is replaced, a deep copy is performed. The corresponding Java method is updated to reference the new nmethod, while the old one is marked as unused. The garbage collector handles final cleanup and deallocation.

This change does not modify existing code paths and therefore does not benefit much from existing tests. New tests were created and confirmed to pass on x64/aarch64 for slowdebug/fastdebug/release.

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Commit messages:
 - Exclude OSR
 - Only run RelocateNMethodMultiplePaths on debug builds
 - Updates after JDK-8343789
 - Merge branch 'master' into JDK-8316694-Final
 - Run RelocateNMethod.java with all GCs
 - Run tests with all GCs
 - Add check for already in correct heap
 - Add nmethod::is_relocatable()
 - Clean up
 - Rename replaceNMethod to relocateNMethod
 - ... and 4 more: https://git.openjdk.org/jdk/compare/da2b4f07...7137a07f

Changes: https://git.openjdk.org/jdk/pull/23573/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23573&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316694
  Stats: 1033 lines in 23 files changed: 1010 ins; 2 del; 21 mod
  Patch: https://git.openjdk.org/jdk/pull/23573.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23573/head:pull/23573

PR: https://git.openjdk.org/jdk/pull/23573