[PATCH GCC][04/06]Add copying interface for dependence_info

[Bin Cheng]

HI,
This patch adds copying interface for dependence_info.  The methodology
is we don't copy such information by default, and this interface should
be called explicitly when it is safe and necessary to do so.  Just like
this patch uses the interface in ivopts.
Bootstrap and test in series.  Is it OK?

Thanks,
bin
2017-08-10  Bin Cheng  <bin.cheng@arm.com>

	* tree-ssa-address.c (copy_dependence_info): New function.
	* tree-ssa-address.h (copy_dependence_info): New declaration.
	* tree-ssa-loop-ivopts.c (rewrite_use_address): Call above func.
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