re PR tree-optimization/54713 (error: non-trivial conversion at assignment in gcc...

re PR tree-optimization/54713 (error: non-trivial conversion at assignment in gcc.c-torture/compile/pr53410-2.c)

	PR tree-optimization/54713
	* fold-const.c (vec_cst_ctor_to_array): Give up if vector CONSTRUCTOR
	has vector elements.
	(fold_ternary_loc) <case BIT_FIELD_REF>: Likewise.
	* tree-vect-generic.c (vector_element): Don't rely on CONSTRUCTOR elts
	indexes.  Use BIT_FIELD_REF if CONSTRUCTOR has vector elements.
	(lower_vec_perm): Use NULL_TREE CONSTRUCTOR indexes.

	* gcc.c-torture/compile/pr54713-1.c: New test.
	* gcc.c-torture/compile/pr54713-2.c: New test.
	* gcc.c-torture/compile/pr54713-3.c: New test.

From-SVN: r191826