* doc/sourcebuild.texi (Test Directives) Add dg-message.
gcc/testsuite/
	* lib/gcc-dg.exp(process_message): New proc.
	(dg-message): New test directive.
	* gcc.dg/always_inline.c: Use dg-message.
	* gcc.dg/always_inline2.c: Ditto.
	* gcc.dg/always_inline3.c: Ditto.
	* gcc.dg/invalid-call-1.c: Ditto.
	* gcc.dg/pr17506.c: Ditto.
	* gcc.dg/simd-5.c: Ditto.
	* gcc.dg/simd-6.c: Ditto.
	* gcc.dg/va-arg-2.c: Ditto.
	* gcc.dg/cpp/syshdr.c: Ditto.
	* gcc.dg/cpp/unc4.c: Ditto.
	* gcc.dg/cpp/trad/mi1.c: Ditto.
	* gcc.dg/cpp/trad/mi5.c: Ditto.
	* gcc.dg/cpp/trad/mi7.c: Ditto.
	* gcc.test-framework/dg-outexistsnot-exp-P.c: Ditto.
	* gcc.test-framework/dg-outexists-exp-F.c: Ditto.
	* gcc.test-framework/test-framework.awk: Special-case outexists
	tests.

Co-Authored-By: Manuel López-Ibáñez <manu@gcc.gnu.org>

From-SVN: r124952