ifcvt-1.c: Compile also for 64-bit i?86-*-* target.

ifcvt-1.c: Compile also for 64-bit i?86-*-* target.

	* gcc.dg/ifcvt-1.c: Compile also for 64-bit i?86-*-* target.
	* gcc.dg/ifcvt-2.c: Ditto.
	* gcc.dg/zero_bits_compound-1.c: Ditto.
	* gcc.dg/zero_bits_compound-1.c: Ditto.
	* gcc.dg/pr40550.c: Simplify target selectors.
	Use dg-additional-options.
	* gcc.dg/pr47893.c: Ditto.
	* gcc.dg/pr68435.c: Compile also for i?86-*-* target.  Add -march=i686
	additional options for 32-bit x86 targets.
	* gcc.dg/pr70955.c: Move to ...
	* gcc.target/i386/pr70955.c: ... here.  Simplify target selector.

From-SVN: r240381