Backport 21180 pshopify#570

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tenderworks wants to merge 2 commits intov3.4.1-pshopify2from

backport-21180-pshopify

Commits on Mar 14, 2025

Have `ast` live longer in ISeq.compile_file to fix GC stress crash

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tenderworks
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Push a real iseq in rb_vm_push_frame_fname()

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tenderworks
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