RFR: 8315966: Relativize initial_sp in interpreter frames [v2]

[Fredrik Bredberg]

On Thu, 21 Sep 2023 12:45:07 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> Hi, I have arranged tier1-3 test on linux-riscv64 platform. Thanks for adding handling for riscv.
>
>> Hi, I have arranged tier1-3 test on linux-riscv64 platform. Thanks for adding handling for riscv.
> 
> Tier1-3 test is clean. The riscv part looks good except for the nit.

Thanks for the review { @RealFYang, @pchilano, @TheRealMDoerr }.

The "Updated after review" version contains the following changes.

1. The extra space in `interp_masm_riscv.cpp` was removed.
2. I'm now using `R0` as a scratch register in `InterpreterMacroAssembler::save_interpreter_state` on PowerPC.
3. I removed some local variables in `FreezeBase::relativize_interpreted_frame_metadata` and `ThawBase::derelativize_interpreted_frame_metadata` that are no longer needed (x86, AArch64 and RISC-V).

Runs tier1-4 ok on supported platforms. PowerPC and RISC-V was sanity tested using Qemu.
Please check if still looks ok.

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PR Comment: https://git.openjdk.org/jdk/pull/15815#issuecomment-1735406747