GetSourceVersion: Strip off svninfo extra markers, which aren't really part of the version.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115074 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/GetSourceVersion b/utils/GetSourceVersion
index 5481f39..cbed7da 100755
--- a/utils/GetSourceVersion
+++ b/utils/GetSourceVersion
@@ -15,7 +15,7 @@
 
 cd $1
 if [ -d .svn ]; then
-  svnversion
+  svnversion | sed -e "s#\([0-9]*\)[A-Z]*#\1#"
 elif [ -d .git/svn ]; then
   git svn info | grep 'Revision:' | cut -d: -f2-
 elif [ -d .git ]; then