clone: record the remote primary branch with remotes/$origin/HEAD

This matches c51d13692d commit to
record the primary branch of the remote with a symbolic ref
remotes/$origin/HEAD.  The user can later change it to point at
different branch to change the meaning of "$origin" shorthand.

Signed-off-by: Junio C Hamano <junkio@cox.net>

git-clone.sh

@@ -45,7 +45,7 @@ Perhaps git-update-server-info needs to be run there?"
 		if test -n "$use_separate_remote" &&
 		   branch_name=`expr "$name" : 'heads/\(.*\)'`
 		then
-			tname="remotes/$branch_name"
+			tname="remotes/$origin/$branch_name"
 		else
 			tname=$name
 		fi
@@ -370,7 +370,7 @@ then
 Pull: refs/heads/$head_points_at:refs/$origin_tracking" &&
 		case "$use_separate_remote" in
 		t) git-update-ref HEAD "$head_sha1" ;;
-		*) git-update-ref "refs/$origin" $(git-rev-parse HEAD)
+		*) git-update-ref "refs/$origin" $(git-rev-parse HEAD) ;;
 		esac &&
 		(cd "$GIT_DIR/$remote_top" && find . -type f -print) |
 		while read dotslref
@@ -379,7 +379,13 @@ Pull: refs/heads/$head_points_at:refs/$origin_tracking" &&
 			test "$head_points_at" = "$name" ||
 			test "$origin" = "$head" ||
 			echo "Pull: refs/heads/${name}:$remote_top/${name}"
-		done >>"$GIT_DIR/remotes/$origin"
+		done >>"$GIT_DIR/remotes/$origin" &&
+		case "$use_separate_remote" in
+		t)
+			rm -f "refs/remotes/$origin/HEAD"
+			git-symbolic-ref "refs/remotes/$origin/HEAD" \
+				"refs/remotes/$origin/$head_points_at"
+		esac
 	esac
 
 	case "$no_checkout" in