KarpelesLab / goro / 26066024770

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ext/mbstring: fix infinite recursion in findFirstString on cyclic arrays

PHP arrays can hold references to themselves (e.g.
\`\$a = []; \$a[] = &\$a;\`). The previous traversal recursed into
each element unconditionally and overflowed Go's goroutine stack
when given such a cycle — the trigger was a particular mb_convert_*
test variant.

Added a visited-set parameter (same shape as
compile-unset.go's callDestructorIfNeededVisited).

Note: the overflow was the root cause of the CI cascades observed
in the recent NoDiscard / static var / VarVarRead lowering CIs —
the lowerings shifted memory pressure so the overflow hit earlier.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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