[PECOFF][Driver] Split WinLinkDriver::parse for readability.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@187161 91177308-0d34-0410-b5e6-96231b3b80d8
[PECOFF][Driver] Add /nologo command line option.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@187162 91177308-0d34-0410-b5e6-96231b3b80d8