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PR/6552 * function.c (struct epi_info): New field const_equiv. (update_epilogue_consts): New function. (keep_stack_depressed): Clear new field and verify scratch register doesn't have it set. Call new function via note_stores. (handle_epilogue_set): Allow setting SP equiv reg in different mode. Allow PLUS where second operand is register known set to constant. (emit_equiv_load): Write load using proper mode if source different. * config/mips/mips.md (return_internal): Put (return) first. From-SVN: r73609
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