RFR: 8361536: [s390x] Saving return_pc at wrong offset [v2]

[Amit Kumar]

> Fixes the bug where return pc was stored at a wrong offset, which causes issue with java abi. 
> 
> Issue appeared in #26004, see the comment: https://github.com/openjdk/jdk/pull/26004#issuecomment-3017928879.

Amit Kumar has updated the pull request incrementally with one additional commit since the last revision:

  re-adjust offset, 80 is free so we can start saving from there

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26209/files
  - new: https://git.openjdk.org/jdk/pull/26209/files/f01c0e4f..2a377c17

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26209&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26209&range=00-01

  Stats: 16 lines in 1 file changed: 0 ins; 0 del; 16 mod
  Patch: https://git.openjdk.org/jdk/pull/26209.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26209/head:pull/26209

PR: https://git.openjdk.org/jdk/pull/26209