* gnat.dg/opt20.ads: Move dg directive to...
	* gnat.dg/opt20.adb: ...here.
	* gnat.dg/addr1.ad[sb]: Likewise.
	* gnat.dg/concat2.ad[sb]: Likewise.
	* gnat.dg/array16.ad[sb]: Likewise.
	* gnat.dg/atomic5.ad[sb]: Likewise.
	* gnat.dg/discr29.ad[sb]: Likewise.
	* gnat.dg/noreturn5.ad[sb]: Likewise.
	* gnat.dg/vect8.ad[sb]: Likewise.  Add dg-options.
	* gnat.dg/discr23.ads: Remove dg directive.
	* gnat.dg/nested_float_packed.ads: Likewise.
	* gnat.dg/oconst6.ads: Move to...
	* gnat.dg/specs/oconst6.ads: ...here.

From-SVN: r191592