Recognize aarch64_be as valid architecture.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219168 91177308-0d34-0410-b5e6-96231b3b80d8

Author: jsonn

autoconf/config.sub

@@ -251,7 +251,7 @@ case $basic_machine in
 	| alpha64 | alpha64ev[4-8] | alpha64ev56 | alpha64ev6[78] | alpha64pca5[67] \
 	| am33_2.0 \
 	| arc | arm | arm[bl]e | arme[lb] | armv[2345] | armv[345][lb] | avr | avr32 \
-   | aarch64 \
+   | aarch64 | aarch64_be \
    | be32 | be64 \
 	| bfin \
 	| c4x | clipper \
@@ -360,7 +360,7 @@ case $basic_machine in
 	| alpha64-* | alpha64ev[4-8]-* | alpha64ev56-* | alpha64ev6[78]-* \
 	| alphapca5[67]-* | alpha64pca5[67]-* | arc-* \
 	| arm-*  | armbe-* | armle-* | armeb-* | armv*-* \
-   | aarch64-* \
+   | aarch64-* | aarch64_be-* \
 	| avr-* | avr32-* \
 	| be32-* | be64-* \
 	| bfin-* | bs2000-* \