[ELFRelocs] Other architectures do not have *_NUM reloc.

It also seems to be unused. Get rid of it.
Thanks to Rafael for pointing out.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267428 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed