Use a simpler heuristic for placing orphans.
Use a simpler heuristic for placing orphans.

This is a bit easier to read and a lot faster in some cases. A version
of many-sections.s with linker scripts goes from 0m41.232s to
0m19.575s.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@302528 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld