RFR: 8346237: Obsolete the UseOprofile flag

[David Holmes]

The `UseOprofile` flag is obsoleted in JDK 26 and so the code associated with it is removed. That means `linux_wrap_code` is dead code and consequently `CodeHeap::on_code_mapping` is also dead code.

Testing:
 - tiers 1-3 sanity

Thanks

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Commit messages:
 - 8346237: Obsolete the UseOprofile flag

Changes: https://git.openjdk.org/jdk/pull/25687/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25687&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346237
  Stats: 60 lines in 5 files changed: 3 ins; 55 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/25687.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25687/head:pull/25687

PR: https://git.openjdk.org/jdk/pull/25687