[PATCH GCC8][16/33]Move multiplier_allowed_in_address_p to tree-ssa-address

[Bin Cheng]

Hi,
Now function multiplier_allowed_in_address_p is no longer referred in ivopts,
so move to the only file using it and make it static.

Thanks,
bin
2017-04-11  Bin Cheng  <bin.cheng@arm.com>

	* tree-ssa-loop-ivopts.c (multiplier_allowed_in_address_p): Move
	from ...
	* tree-ssa-address.c (multiplier_allowed_in_address_p): ... to here
	as local function.  Include necessary header files.
	* tree-ssa-loop-ivopts.h (multiplier_allowed_in_address_p): Delete.
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