RFR: 8213762: Deprecate Xmaxjitcodesize

[Anton Seoane Ampudia]

This PR deprecates the `Xmaxjitcodesize` flag in JDK 26. Please see the CSR for specific details on why this flag is being deprecated and workarounds for users interested in keeping similar behaviour in the future.

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Commit messages:
 - Add deprecation notice to Xmaxjitcodesize

Changes: https://git.openjdk.org/jdk/pull/28297/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28297&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8213762
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28297.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28297/head:pull/28297

PR: https://git.openjdk.org/jdk/pull/28297