This patch renames the configure switches to be explicit that they are for the
PowerPC, and that they are temporary.  I would hope by the time GCC 7 exits
stage1 that these switches will be removed, but having them now will allow us
to move to LRA and __float128 in an orderly fashion.

I built a bootstrap compiler using the --enable-powerpc-lra option, and it ran
fine.  There were two additional tests that generate different code with -mlra
and now fail.  These will be fixed in later patches.

I also built a C only compiler using the --enable-powerpc-float128 option
(disabling libquadmath and bootstrap), and the C tests looked fine.

Can I install these patches in the trunk?

2016-07-20  Michael Meissner  <meissner@linux.vnet.ibm.com>

	* doc/install.texi (Configuration): Document PowerPC specific
	configuration options --enable-powerpc-lra and
	--enable-powerpc-float128.
	* configure.ac: Add support for the configuration option
	--enable-powerpc-lra to enable the use of the LRA register
	allocator by default.  Add support for the configuration option
	--enable-powerpc-float128 to enable the use of the __float128 type
	in PowerPC Linux systems.
	* configure: Regenerate.
	* config.gcc (powerpc*-*-linux*): Add --enable-powerpc-lra and
	--enable-powerpc-float128 support.
	* config/rs6000/rs6000.c (rs6000_option_override_internal): Add
	support for --enable-powerpc-lra and --enable-powerpc-float128.

-- 
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meissner@linux.vnet.ibm.com, phone: +1 (978) 899-4797