[PECOFF] Emit ModuleHandle field in delay-import table.

Previously the field was not set. The field should be pointing to
a placeholder where the DLL delay-loader writes the base address
of a DLL.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@219415 91177308-0d34-0410-b5e6-96231b3b80d8