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The source from PR124561 led to an ICE with --enable-checking, caused by a stack overflow. The recursive verification code verify_vssa in tree-ssa.cc could not handle the extreme number of basic blocks within the typical limits of stack space. As for PR124561 the recursive code was transformed into an iterative version, which avoided the recursive calls. A worklist is used, which has as entries a pair of a basic_block and a tree (vdef). The logic of verification steps for each basic_block is unchanged, although the order of basic_blocks is changed. This fixes PR124805. Reg tested OK. 2026-04-07 Heiko Eißfeldt <heiko@hexco.de> PR middle-end/124805 * tree-ssa.cc (verify_vssa): replace recursive calls with iteration for lower stack usage
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