RFR: 8373110: jstack --mixed frames are broken on macOS after JDK-8371194

[Yasumasa Suenaga]

[JDK-8371194](https://bugs.openjdk.org/browse/JDK-8371194) (PR #28284) has broken PStack (jstack --mixed) behavior on macOS. It affects both AMD64 and AArch64. See JBS for details.

This PR fixes it to implement `CFrame::toFrame`.

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Commit messages:
 - Override 2 "sender" method in Bsd CFrame classes
 - 8373110: jstack --mixed frames are broken on macOS after JDK-8371194

Changes: https://git.openjdk.org/jdk/pull/28686/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28686&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373110
  Stats: 96 lines in 3 files changed: 67 ins; 3 del; 26 mod
  Patch: https://git.openjdk.org/jdk/pull/28686.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28686/head:pull/28686

PR: https://git.openjdk.org/jdk/pull/28686