re PR tree-optimization/86614 (duplicate -Warray-bounds for a strncpy  call with out-of-bounds offset)

	PR tree-optimization/86614
	* gimple-ssa-warn-restrict.c (maybe_diag_offset_bounds): Return early
	if TREE_NO_WARNING is set on ref.ref.

	* c-c++-common/Warray-bounds-2.c (wrap_strncpy_dstarray_diff_neg,
	call_strncpy_dstarray_diff_neg): Don't expect late -Warray-bounds
	warnings, just early ones from FE.  Remove dg-prune-output.
	* c-c++-common/Warray-bounds-6.c: New test.

From-SVN: r266403