Add unwind support for epilogues, because the kernel unwinder needs them.
* config/ia64/ia64-protos.h (ia64_output_end_prologue): Add.
(output_function_prologue): Fix mispelling.
(output_function_prologue, output_function_epilogue): Reorder to
match ia64.c definition order.
* config/ia64/ia64.c (ia64_expand_prologue): Add comment.
(ia64_expand_epilogue): Set RTX_FRAME_RELATED_P on stack restore insns.
Use r3 instead of r2 for large stack restores.
(ia64_output_end_prologue): New function.
(process_set): Emit ".restore sp" for epilogue stack restores.
* config/ia64/ia64.h (FUNCTION_END_PROLOGUE): Define.
From-SVN: r34456