[AArch64][doc] Clarify -msve-vector-bits=128 behaviour

	Backport from mainline
	2018-12-13  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

	* doc/invoke.texi (-msve-vector-bits): Clarify -msve-vector-bits=128
	behavior.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-8-branch@267125 138bc75d-0d04-0410-961f-82ee72b054a4
2 files changed