Rename the test, it is testing the symver directive.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207658 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/MC/ELF/symref.s b/test/MC/ELF/symver.s
similarity index 100%
rename from test/MC/ELF/symref.s
rename to test/MC/ELF/symver.s