* lib/gcc-dg.exp (gcc-dg-test): Rename to ...
	(gcc-dg-test-1): ... this.  Add target_compile parameter.  Add
	support for "repo" mode.
	* lib/g++-dg.exp: Use gcc-dg.exp to implement all functionality.
	* lib/g77-dg.exp: Likewise.
	* lib/obj-dg.exp: Likewise.

From-SVN: r66881