[lldb][NFC] Refactor and document *DumpToStreamOptions
[lldb][NFC] Refactor and document *DumpToStreamOptions

Those two classes were mostly copy-pasted.

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@372836 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lldb,llvm-mirror/lldb,llvm-mirror/lldb,llvm-mirror/lldb,llvm-mirror/lldb