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	(load_mems): Rename copies to load_copies and add new regset
	store_copies.  Check for sets of shadow registers and mark
	in store_copies.   Call try_swap_copy_prop for registers
	marked in store_copies.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@35520 138bc75d-0d04-0410-961f-82ee72b054a4