Implement ObjectFilePECOFF::GetModuleSpecifications().

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@203383 91177308-0d34-0410-b5e6-96231b3b80d8
PlatformWindows: Fix ObjectFile presence test conditions (could result in NULL memory access)

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@203384 91177308-0d34-0410-b5e6-96231b3b80d8