[PECOFF] Print out command line if we have expanded response files.

If a response file is given via command line, the final command line
arguments will not appear in the log because the actual arguments are
in the given file.

This patch is to show the final command line if /verbose is specified
to help users.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@204754 91177308-0d34-0410-b5e6-96231b3b80d8