[Patch, fortran] [53/66] inline sum and product: Update the scalarizer: Update gfc_trans_preloop_setup.

[Mikael Morin]

This updates gfc_trans_preloop_setup to handle multiple loops.
The preliminary patches 1..6 have made it quite painless:
 - the condition "this is the the outermost dimension" is changed from
   `dim == loop->dimen - 1'  to `dim == loop->dimen - 1 && loop->parent == NULL'
 - to retrieve information about the parent loop:
    * if we are not in the outermost dimension, the parent loop's gfc_loopinfo
      struct is the current one, same for the gfc_ss struct, and the loop index
      is dim + 1.
    * if we are in the outermost dimension, the parent loop's gfc_loopinfo
      struct is the current's parent field, same for the gfc_ss struct, and the
      loop index is 0.
OK?
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2011-10-19  Mikael Morin  <mikael@gcc.gnu.org>

	* trans-array.c (gfc_trans_preloop_setup): Create pointers to outer
	dimension's ss and loop. Use them.
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