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The reassoc pass currently walks dominators in a recursive way where I ran into a stack overflow with. The following replaces it with worklists following patterns used elsewhere. * tree-ssa-reassoc.cc (break_up_subtract_bb): Remove recursion. (reassociate_bb): Likewise. (do_reassoc): Implement worklist based dominator walks for both break_up_subtract_bb and reassociate_bb.
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