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geoffk authored* rtl.c (reg_note_name): Add REG_MAYBE_DEAD. * flow.c (propagate_one_insn): Allow deletion of prologue/epilogue insns if they have a REG_MAYBE_DEAD note attached. * config/rs6000/rs6000.c (rs6000_maybe_dead): New function. (rs6000_emit_load_toc_table): TOC loads may go dead. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@35414 138bc75d-0d04-0410-961f-82ee72b054a4
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