Protect doParse() because that's not a public interface.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@224235 91177308-0d34-0410-b5e6-96231b3b80d8
Remove dead code.

This field was not even initialized properly.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@224236 91177308-0d34-0410-b5e6-96231b3b80d8