gcc:
	PR tree-optimization/48497
	* doc/sourcebuild.texi (Directives, dg-additional-options): Document.

	gcc/testsuite:
	PR tree-optimization/48497
	* lib/gcc-defs.exp (dg-additional-options): New proc.
	* gfortran.dg/graphite/vect-pr40979.f90: Use dg-additional-options
	-msse2 on 32-bit x86.

From-SVN: r174759