Fix PR61831: Side-effect variable component deallocation

Fix PR61831: Side-effect variable component deallocation

gcc/fortran/
2015-07-17  Mikael Morin  <mikael@gcc.gnu.org>
	    Dominique d'Humieres  <dominiq@lps.ens.fr>

	PR fortran/61831
	* trans-array.c (gfc_conv_array_parameter): Guard allocatable
	component deallocation code generation with descriptorless
	calling convention flag.
	* trans-expr.c (gfc_conv_expr_reference): Remove allocatable
	component deallocation code generation from revision 212329.
	(expr_may_alias_variables): New function.
	(gfc_conv_procedure_call): New boolean elemental_proc to factor
	check for procedure elemental-ness.  Rename boolean f to nodesc_arg
	and declare it in the outer scope.  Use expr_may_alias_variables,
	elemental_proc and nodesc_arg to decide whether generate allocatable
	component deallocation code.
	(gfc_trans_subarray_assign): Set deep copy flag.

gcc/testsuite/
2015-07-17  Mikael Morin  <mikael@gcc.gnu.org>

	PR fortran/61831
	* gfortran.dg/alloc_comp_auto_array_3.f90: Count the number
	of generated while loops in the tree dump.
	* gfortran.dg/derived_constructor_comps_6.f90: New file.

Co-Authored-By: Dominique d'Humieres <dominiq@lps.ens.fr>
From-SVN: r225926