[3.4] Backport PR#13360 to 3.4 branch#14573
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k0kubun merged 2 commits intoruby:ruby_3_4from Sep 16, 2025
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The following is crashing for me:
```shell
ruby --yjit --yjit-call-threshold=1 -e '1.tap { raise rescue p it }'
ruby: YJIT has panicked. More info to follow...
thread '<unnamed>' panicked at ./yjit/src/codegen.rs:2402:14:
...
```
It seems `it` sometimes points to the wrong value:
```shell
ruby -e '1.tap { raise rescue p it }'
false
ruby -e '1.tap { begin; raise; ensure; p it; end } rescue nil'
false
```
But only when `$!` is set:
```shell
ruby -e '1.tap { begin; nil; ensure; p it; end }'
1
ruby -e '1.tap { begin; nil; rescue; ensure; p it; end }'
1
ruby -e '1.tap { begin; raise; rescue; ensure; p it; end }'
1
```
Co-authored-by: Alan Wu <XrXr@users.noreply.github.com>
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Original bug with no backports: https://bugs.ruby-lang.org/issues/21313
Original PR: #13360
This backport fixes the bug that this backport PR was attempting to address.