* reg-stack.c (propagate_stack): Always copy the source stack to
the destination. This routine is now only called when this is safe.
(better_edge): New function split out from convert_regs_1 to
determine which of two edges is better to propagate across.
(convert_regs_1): We need only search for a best edge if the
stack layout hasn't been defined yet. Use better_edge to help
find beste. No longer traverse unnecessary edges.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@100323
138bc75d-0d04-0410-961f-
82ee72b054a4