I don't know, if this is a misconfiguration on your part or a bug in the web frontend, but if I browse from gcc.gnu.org/git to https://gcc.gnu.org/git/?p=gcc.git;a=tree;f=libstdc%2B%2B-v3;h=ba19769f319ff21297cf78bd31aeca0e0d2d25e0;hb=refs/heads/gcc-4_9-branch then click on 'blob' for any file, the file is displayed as empty with https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libstdc%2B%2B-v3/aclocal.m4;h=60b7ccb59124ea9bdd7736b4c244e5a697edbd76;hb=refs/heads/gcc-4_9-branch path. If I change the path to https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libstdc++-v3/aclocal.m4;h=60b7ccb59124ea9bdd7736b4c244e5a697edbd76;hb=refs/heads/gcc-4_9-branch, the file content gets displayed correctly.
...if there's any confusion, aclocal.m4 is just a random pick
Seems like they display properly to me; does it still have issues for you?
Indeed, it seems the problem got fixed in the meanwhile.