Has the arm branch already been moved to git?
See: developer.arm.com/.../gnu-rm
GNU C/C++ Compiler
You can find the sources to Arm Embedded GCC under svn://gcc.gnu.org/svn/gcc/branches/ARM/. All contributions are made to trunk and patches are cherry-picked on a need basis to the Arm embedded branches.
svn://gcc.gnu.org/svn/gcc/branches/ARM/