Clean up tests where a later dg-do completely overrides another.

Clean up tests where a later dg-do completely overrides another.

The attached patch cleans up some (mostly unnecessary) dg-do
directives in the gcc.dg and gcc.target test cases.

gcc/testsuite/ChangeLog:

2016-04-29  Dominik Vogt  <vogt@linux.vnet.ibm.com>

	* gcc/testsuite/gcc.dg/cpp/mac-dir-2.c: Remove pointless duplicate
	dg-do.
	* gcc/testsuite/gcc.dg/pr27003.c: Likewise.
	* gcc/testsuite/gcc.dg/tree-ssa/cswtch.c: Likewise.
	* gcc/testsuite/gcc.dg/tree-ssa/predcom-2.c: Likewise.
	* gcc/testsuite/gcc.dg/tree-ssa/predcom-4.c: Likewise.
	* gcc/testsuite/gcc.dg/tree-ssa/predcom-5.c: Likewise.
	* gcc.target/arc/mxy.c: Likewise.
	* gcc.target/arc/mswape.c: Likewise.
	* gcc.target/arc/mrtsc.c: Likewise.
	* gcc.target/arc/mcrc.c: Likewise.
	* gcc.target/arc/mdsp-packa.c: Likewise.
	* gcc.target/arc/mdvbf.c: Likewise.
	* gcc.target/arc/mlock.c: Likewise.
	* gcc.target/arc/mmac-24.c: Likewise.
	* gcc.dg/spec-options.c: Switch order of the two "dg-do run".

From-SVN: r235628