[arm][doc] Document new -march= syntax.

This adds documentation for the new extension options to -march= on ARM. I tried a number of different ways of formatting the information, but this seems the best, given what can be achieved in texinfo format. * doc/invoke.texi (ARM Options, -march=): Document new syntax and permitted extensions. From-SVN: r249307

[arm][doc] Document new -march= syntax.
This adds documentation for the new extension options to -march= on ARM. I tried a number of different ways of formatting the information, but this seems the best, given what can be achieved in texinfo format. * doc/invoke.texi (ARM Options, -march=): Document new syntax and permitted extensions. From-SVN: r249307
6d2f99aa · Richard Earnshaw · Richard Earnshaw · ffc12690 · 6d2f99aa · 6d2f99aa
Commit 6d2f99aa authored Jun 16, 2017 by Richard Earnshaw Committed by Richard Earnshaw Jun 16, 2017
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--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
 2017-06-16  Richard Earnshaw  <rearnsha@arm.com>

+	* doc/invoke.texi (ARM Options, -march=): Document new syntax and
+	permitted extensions.
+
+2017-06-16  Richard Earnshaw  <rearnsha@arm.com>
+
 	* config/arm/arm-cpus.in (armv7): Add extension +nofp.
 	(armv7-r): Add aliases vfpv3xd and vfpv3-d16.
 	(armv8-m.main): Add option +nodsp.

--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi