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PR c++/89652 * constexpr.c (struct constexpr_ctx): Change save_exprs type from hash_set<tree> to vec<tree>. (cxx_eval_call_expression): Adjust for save_exprs being a vec instead of hash_set. (cxx_eval_loop_expr): Likewise. Truncate the vector after each removal of SAVE_EXPRs from values. (cxx_eval_constant_expression) <case SAVE_EXPR>: Call safe_push method on save_exprs instead of add. * g++.dg/cpp1y/constexpr-89652.C: New test. From-SVN: r269671
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