[ruby-core:102051] [Ruby master Feature#17490] Rename RubyVM::MJIT to RubyVM::JIT

Issue #17490 has been updated by matz (Yukihiro Matsumoto).


As of #15743, it was made clear that `RubyVM` means CRuby specific module (OK? @eregon). I am OK with renaming it `JIT` (or not).
So it's totally up to @k0kubun.

In addition, I don't think we need a migration path for this internal feature.

Matz.


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Feature #17490: Rename RubyVM::MJIT to RubyVM::JIT
https://bugs.ruby-lang.org/issues/17490#change-89907

* Author: k0kubun (Takashi Kokubun)
* Status: Open
* Priority: Normal
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## Background
These days it's sometimes said that CRuby may add another lightweight JIT. Leaving `RubyVM::MJIT` under such a situation might imply `RubyVM::MJIT` will not impact the future JIT, but I think `MJIT.pause`/`MJIT.resume` should impact all JITs by default if `--jit` is going to enable all the JITs. The current naming will be confusing, and I think these features should named consistently with `--jit`.

I also think, although this feature is for JIT developers anyway, we should not add many APIs to control JIT (for now I want JIT to be a feature where users don't need to think about tuning it, and having such APIs might end up letting people do that), and this naming change will contribute to discouraging APIs for a particular JIT.

## Proposal
Have the same constant as `RubyVM::JIT`, deprecate `RubyVM::MJIT` from Ruby 3.1, and remove the old one in Ruby 3.2.

## Impact
This impacts only [Feature #14830] `RubyVM::MJIT.pause` / `RubyVM::MJIT.resume`, which is basically for k0kubun's own testing.



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