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* function.c (frame_required_for_rtx): Remove function. (requires_stack_frame_p): New arg set_up_by_prologue. All callers changed. Compute a set of mentioned registers and compare against the new arg rather than calling frame_required_for_rtx. (thread_prologue_and_epilogue_insns): Compute the set_up_by_prologue reg set. Convert the unconverted_simple_returns mechanism to store jump insns rather than their basic blocks. Also check the orig_entry_edge destination for new blocks. From-SVN: r179654
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