[Arm32-JIT] Elixir fixes

[ziopio]

This PR is inspired by #23

[ziopio]

This change fixes a bug while loading Elixir.String.Tokenizer.
This caused the next line to emit sub r12 r12 257 which is illegal.

[ziopio]

During loading of module Elixir.Exceptions this emitter was producing more then 2KB of assembly.

This was breaking asmjit code generation as the next stub creation was forced to handle a displacement value that was over 4KB.

The displacement happened to be over 4KB by 100~200 bytes

[ziopio]

@fhunleth while rebasing on maint-27 I realized that the OTP team fixed THIS same BUG in 27.2, they basically did the same fix for arm64, but added the check_pending_stubs at the end of the loops, which sligthly makes more sense.

[ziopio]

@fhunleth please let me know if these fixes are also working on your hardware.

I tested with qemu and I think I pinpointed the issues you experienced.

[fhunleth]

@ziopio This is great! Thank you for digging through all of that AI code I shared. I'll should be able to try it out tomorrow!

[ziopio]

@fhunleth these commits are already on the branch arm32-jit-maint-27 I suggest you to try this new branch that uses latest OTP-27 and can run elixir 1.20.2

[fhunleth]

@ziopio This branch didn't work, but it is really close. To make it work, I only had to add this change:

https://github.com/fhunleth/otp/blob/41142ef00fb14d6567cd5d314e033e4d6baf8eaf/erts/emulator/beam/jit/arm/32/beam_asm_module.cpp#L574-L577

$ diff erlang-27.0/erts/emulator/beam/jit/arm/32/beam_asm_module.cpp erlang-27.0-works-2/erts/emulator/beam/jit/arm/32/beam_asm_module.cpp 
574c574,577
<                                  Constant{.latestOffset = maxOffset,
---
>                                  Constant{.latestOffset = std::max<ssize_t>(
>                                                    currOffset,
>                                                    maxOffset -
>                                                            STUB_CHECK_INTERVAL),