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PR tree-optimization/40436 * ipa-inline.c (leaf_node_p): Implement using is_inexpensive_builtin. * tree-inline.c (estimate_num_insns): Inexpensive builtins are like normal instructions; be sure bultin is not implemented in this file; compute non-zero return cost. (init_inline_once): Reduce builtin_call_cost to 1; set return cost. * tree-inline.h (eni_weights_d): Add return cost. From-SVN: r166517
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