[Patch, fortran] [34/66] inline sum and product: Update the scalarizer: gfc_ss_info refcounting

[Mikael Morin]

As there will be more than one gfc_ss struct pointing to a single gfc_ss_info,
it needs to be reference counted. This introduces reference counting.
OK?
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2011-10-19  Mikael Morin  <mikael@gcc.gnu.org>

	* trans.h (struct gfc_ss_info): New field refcount.
	* trans-array.c (free_ss_info): Decrement refcount. Return early if
	still non-zero.
	(gfc_get_array_ss, gfc_get_temp_ss, gfc_get_scalar_ss): Increment
	refcount.
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