Reduce dependency to OutputSectionFactory.
Reduce dependency to OutputSectionFactory.

The Factory class is too object-oriented-ish and easy to be abused.
This patch reduces dependency to that class. Eventually we want to
remove the dependency to that class from LinkerScript.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@278084 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld