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regression in gc safety of debuginfo #53434

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If a codeinst is not in a cache, it is not legal to call the code generation method, as this method pushes the object into the global debuginfo / JIT structs and later returns those, which can result in GC use-after free bugs

Originally posted by @vtjnash in #53219 (comment)

Posting as a new issue, since the original PR is already merged, so that this doesn't get lost

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    GCGarbage collectorregressionRegression in behavior compared to a previous version

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