[Patch, fortran] [47..48/66] inline sum and product: Update the scalarizer: New gfc_loopinfo::nested_loop field.

[Mikael Morin]

This introduces the nested_loop list of nested loops inside a gfc_loopinfo
struct (patch 47).
Patch 48 adds to the scalarizer functions self-recursive calls on the nested
loops.
OK?
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2011-10-19  Mikael Morin  <mikael@gcc.gnu.org>

	* trans.h (struct gfc_loopinfo): New fields nested and next.
	* trans-array.c (gfc_add_ss_to_loop): Update list of nested list if
	ss has non-null nested_ss field.
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2011-10-19  Mikael Morin  <mikael@gcc.gnu.org>

	* trans-array.c (gfc_add_loop_ss_code): Skip non-nestedmost ss.
	Call recursively gfc_add_loop_ss_code for all the nested loops.
	(gfc_conv_ss_startstride): Only get the descriptor for the outermost
	ss. Call recursively gfc_conv_ss_startstride for all the nested loops.
	(set_loop_bounds): Call recursively for all the nested loops.
	(set_delta): Ditto.
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