[PECOFF] Enable RoundTrip{YAML,Native}Pass.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@193881 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@193882 91177308-0d34-0410-b5e6-96231b3b80d8