[lworld] RFR: 8295655: [lworld] AArch64: Deoptimization from return value stub fails

[Tobias Hartmann]

If found this old issue after enabling stress testing on aarch64, similar to x86_64, `set_last_Java_frame` in `generate_return_value_stub` should not set fp on aarch64.

Thanks,
Tobias

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Commit messages:
 - 8295655: [lworld] AArch64: Deoptimization from return value stub fails

Changes: https://git.openjdk.org/valhalla/pull/796/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=796&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295655
  Stats: 7 lines in 3 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/valhalla/pull/796.diff
  Fetch: git fetch https://git.openjdk.org/valhalla pull/796/head:pull/796

PR: https://git.openjdk.org/valhalla/pull/796