[Patch, fortran] [40..43/66] inline sum and product: Update the scalarizer: New gfc_ss::parent field.

[Mikael Morin]

We are going to loop over the parent array infos.
This introduces a new parent field to permit this loop (patch 40).
Then it will be used to loop over multiple parent ss:
 - gfc_set_loop_bounds_from_array_spec (patch 41 with context diff)
 - gfc_trans_array_constructor (patch 42)
 - set_vector_loop_bounds (patch 43)
OK?
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2011-10-19  Mikael Morin  <mikael@gcc.gnu.org>

	* trans.h (struct gfc_ss): New field parent.
	* trans-array.c (gfc_trans_scalarizing_loops): Skip clearing if a
	parent exists.
	* trans-expr.c (gfc_advance_se_ss_chain): Move to parent ss at the
	end of the chain.
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2011-10-19  Mikael Morin  <mikael@gcc.gnu.org>

	* trans-array.c (gfc_set_loop_bounds_from_array_spec): Loop over the
	parents.
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2011-10-19  Mikael Morin  <mikael@gcc.gnu.org>

	* trans-array.c (gfc_trans_array_constructor): Loop over the parents.
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2011-10-19  Mikael Morin  <mikael@gcc.gnu.org>

	* trans-array.c (gfc_set_vector_loop_bounds): Loop over the parents.
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