[pull] master from ruby:master#910
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pull[bot] merged 5 commits intoturkdevops:masterfrom Apr 4, 2026
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When two GuardType instructions in the same basic block guard the same value with the same (or narrower) type, the second guard is redundant. For example, `(n - 1) + (n - 2)` generates two `GuardType n, Fixnum` — one for each subtraction — but after the first guard succeeds, the second is guaranteed to succeed as well. The new logic in fold_constants tracks every GuardType emitted so far in the current block. If a later GuardType's (val, guard_type) pair is already covered (i.e. guard_type is a subtype of the earlier guard's type), the later guard is replaced with the earlier result via make_equal_to.
Address review feedback: use a method instead of directly comparing .status == IseqStatus::Invalidated.
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