sourcebuild.texi: (dfp_hw): Document.

sourcebuild.texi: (dfp_hw): Document.

gcc/
	* doc/sourcebuild.texi: (dfp_hw): Document.
	(p8vector_hw): Likewise.
	(powerpc_eabi_ok): Likewise.
	(powerpc_elfv2): Likewise.
	(powerpc_htm_ok): Likewise.
	(ppc_recip_hw): Likewise.
	(vsx_hw): Likewise.

gcc/testsuite/
	* lib/target-support.exp (check_dfp_hw_available): New function.
	(is-effective-target): Check $arg for dfp_hw.
	(is-effective-target-keyword): Likewise.
	* gcc.target/powerpc/pack03.c: (dg-require-effective-target):
	Change target to dfp_hw.

From-SVN: r210404