RFR: 8315069: Relativize extended_sp in interpreter frames [v2]

[Fredrik Bredberg]

> Implementation of relativized extended_sp in interpreter frames for AArch64 and RISC-V.
> 
> By changing the "extended_sp" member in interpreter frames from being an absolute address into an offset that is relative to the frame pointer, we don't need to change the value as we freeze and thaw frames of virtual threads. This is since we might freeze and thaw from and to different worker threads, so the absolute address to locals might change, but the offset from the frame pointer will be constant.
> 
> This subtask only handles "extended_sp". The relativization of other interpreter frame members are handled in other subtasks to JDK-8289296.
> 
> Tested tier1-tier7 on aarch64. RISC-V  was sanity tested using Qemu.

Fredrik Bredberg has updated the pull request incrementally with one additional commit since the last revision:

  Updated aarch64 after review

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/15468/files
  - new: https://git.openjdk.org/jdk/pull/15468/files/b67579df..1256fe65

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15468&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15468&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/15468.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15468/head:pull/15468

PR: https://git.openjdk.org/jdk/pull/15468