Note that Arm32 is already saving the full register in
https://source.chromium.org/chromium/chromium/src/+/main:v8/src/codegen/arm/macro-assembler-arm.cc;l=2250;drc=ec4fd32cf7f945923fa6bb332c061ecbdaaaa405

Change-Id: I1f5fe60ca350583fb4cb877ccad74f5e260c3665
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2912778
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74778}