Update to LLVM 3.5a.

Change-Id: Ifadecab779f128e62e430c2b4f6ddd84953ed617
diff --git a/autoconf/config.guess b/autoconf/config.guess
index 370da42..73d671b 100755
--- a/autoconf/config.guess
+++ b/autoconf/config.guess
@@ -864,6 +864,9 @@
     i*86:Minix:*:*)
 	echo ${UNAME_MACHINE}-pc-minix
 	exit ;;
+    aarch64*:Linux:*)
+	    echo ${UNAME_MACHINE}-unknown-linux-gnu
+	exit ;;
     alpha:Linux:*:*)
 	case `sed -n '/^cpu model/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo` in
 	  EV5)   UNAME_MACHINE=alphaev5 ;;