Remove blank return at the end of a function returning void.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@195279 91177308-0d34-0410-b5e6-96231b3b80d8
Move member functions to its own cpp file.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@195281 91177308-0d34-0410-b5e6-96231b3b80d8
Reverse the condition for readability.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@195282 91177308-0d34-0410-b5e6-96231b3b80d8