* config/mep/mep.c (machine_function): Add frame_locked flag. Set

it once we start generating the prologue or epilogue.
(mep_call_saves_register): If the frame is locked, re-use cached values.
(mep_assign_save_slots): New, broken out from mep_expand_prologue.
(mep_expand_prologue): Call it.
(mep_expand_epilogue): Likewise.
(mep_start_function): Use the same logic as mep_expand_prologue.
(mep_pass_by_reference): Make logic more readable.
(mep_return_in_memory): Zero-sized objects are passed in memory.
(mep_reorg_noframe): Make sure we have accurate REG_DEAD notes.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@151248 138bc75d-0d04-0410-961f-82ee72b054a4

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