Put missing license header.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@193435 91177308-0d34-0410-b5e6-96231b3b80d8
Fix spelling.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@193440 91177308-0d34-0410-b5e6-96231b3b80d8