[utils] Fix Get{RepositoryPath,SourceVersion} to have a more robust is-git-svn

check.

llvm-svn: 156836

llvm/utils/GetRepositoryPath

@@ -16,7 +16,7 @@ fi
 cd $1
 if [ -d .svn ]; then
   svn info | grep 'URL:' | cut -d: -f2-
-elif [ -d .git/svn ]; then
+elif [ -f .git/svn/.metadata ]; then
   git svn info | grep 'URL:' | cut -d: -f2-
 elif [ -d .git ]; then
   git remote -v | grep 'fetch' | awk '{ print $2 }'

llvm/utils/GetSourceVersion

@@ -16,7 +16,7 @@ fi
 cd $1
 if [ -d .svn ]; then
   svnversion | sed -e "s#\([0-9]*\)[A-Z]*#\1#"
-elif [ -d .git/svn ]; then
+elif [ -f .git/svn/.metadata ]; then
   git svn info | grep 'Revision:' | cut -d: -f2-
 elif [ -d .git ]; then
   git log -1 --pretty=format:%H