PR fortran/12840
	* trans.h (gfor_fndecl_internal_realloc): Declare.
	(gfor_fndecl_internal_realloc64): Declare.
	* trans-decl.c (gfor_fndecl_internal_realloc): New variable.
	(gfor_fndecl_internal_realloc64): New variable.
	(gfc_build_builtin_function_decls): Initialize them.
	* trans-array.h (gfc_trans_allocate_temp_array): Add a fourth argument.
	* trans-array.c (gfc_trans_allocate_array_storage): Add an argument
	to say whether the array can grow later.  Don't allocate the array
	on the stack if so.  Don't call malloc for zero-sized arrays.
	(gfc_trans_allocate_temp_array): Add a similar argument here.
	Pass it along to gfc_trans_allocate_array_storage.
	(gfc_get_iteration_count, gfc_grow_array): New functions.
	(gfc_iterator_has_dynamic_bounds): New function.
	(gfc_get_array_constructor_element_size): New function.
	(gfc_get_array_constructor_size): New function.
	(gfc_trans_array_ctor_element): Replace pointer argument with
	a descriptor tree.
	(gfc_trans_array_constructor_subarray): Likewise.  Take an extra
	argument to say whether the variable-sized part of the constructor
	must be allocated using realloc.  Grow the array when this
	argument is true.
	(gfc_trans_array_constructor_value): Likewise.
	(gfc_get_array_cons_size): Delete.
	(gfc_trans_array_constructor): If the loop bound has not been set,
	split the allocation into a static part and a dynamic part.  Set
	loop->to to the bounds for static part before allocating the
	temporary.  Adjust call to gfc_trans_array_constructor_value.
	(gfc_conv_loop_setup): Allow any constructor to determine the
	loop bounds.  Check whether the constructor has a dynamic size
	and prefer to use something else if so.  Expect the loop bound
	to be set later.  Adjust call to gfc_trans_allocate_temp_array.
	* trans-expr.c (gfc_conv_function_call): Adjust another call here.

From-SVN: r104073