[PATCH][arm][doc] Document accepted -march=armv8.3-a extension options

[Kyrill Tkachov]

Hi all,

I noticed that we helpfully list the extensions that are accepted
by the -march options on arm but we were missing the information
for 'armv8.3-a'.

This patchlet corrects that.
Built the documentation and it looked ok.

Committing to trunk.

Thanks,
Kyrill

2017-12-20  Kyrylo Tkachov  <kyrylo.tkac...@arm.com>

    * doc/invoke.texi (ARM Options): Document accepted extension options
    for -march=armv8.3-a.

commit 68a56ead5df086cf11aea7651e76336b504a883d
Author: Kyrylo Tkachov <kyrylo.tkac...@arm.com>
Date:   Mon Dec 18 19:07:22 2017 +0000

    [arm][doc] Document accepted Armv8.3-A extension options

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 2049c27..9390882 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -15852,6 +15852,7 @@ Disable the floating-point, Advanced SIMD and cryptographic instructions.
 @end table
 
 @item armv8.2-a
+@itemx armv8.3-a
 @table @samp
 @item +fp16
 The half-precision floating-point data processing instructions.