[avr,patch,applied] avr: Don't document -mlra

[Georg-Johann Lay]

This patch sets the Undocumented flag for -mlra because
it is likely just a transient option and only experimental.
Johann

--

    AVR: -mlra is not documeted in TEXI.

    gcc/
            * config/avr/avr.opt (mlra): Set Undocumented flag.

diff --git a/gcc/config/avr/avr.opt b/gcc/config/avr/avr.opt
index 947489eddf0..444ed7edb26 100644
--- a/gcc/config/avr/avr.opt
+++ b/gcc/config/avr/avr.opt
@@ -19,7 +19,7 @@
 ; <http://www.gnu.org/licenses/>.

 mlra
-Target Var(avr_lra_p) UInteger Init(0) Optimization
+Target Var(avr_lra_p) UInteger Init(0) Optimization Undocumented
 Usa LRA for reload instead of the old reload framework.  This option 
is experimental, and it may be removed in future versions of the compiler.

 mcall-prologues