[fortran,committed] Simplify code for memory allocation and freeing

[FX]

The attached patch simplifies code in various gcc/fortran/trans* routines related to malloc and free:

  - we don’t need to check if types match before calling fold_convert(): fold_convert() does it itself
  - in some cases where the argument is used only once, we don’t need to call gfc_evaluate_now()
  - in other cases, we can used save_expr() instead of gfc_evaluate_now(), which is simpler to use and doesn’t create a new decl
  - the callers of gfc_call_free() don’t need to convert their argument to pvoid_type_node: gfc_call_free() itself does it

The resulting code is simpler, shorter and more unified.

Committed as revision 227316, after regtesting on x86_64-pc-linux-gnu.

FX


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