temporary commit.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@208427 91177308-0d34-0410-b5e6-96231b3b80d8
[PECOFF] DLL extension can be omitted in .def file.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@208428 91177308-0d34-0410-b5e6-96231b3b80d8