Remove a duplicated member variable. NFC.
Remove a duplicated member variable. NFC.

This just makes it clear that, for now, there is only one symbol table.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@245844 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld