This was actually a merge error on the branch. When crtstuff.c moved to libgcc/, Aldy failed to copy the changes.
I've tidied things even a bit more from the branch, with the introduction of the USE_TM_CLONE_REGISTRY control macro, which is in turn now predicated on ELF. Tested on x86_64-linux. I'm really not sure what non-elf targets really use this file... r~
