Fix a bug when generating Binary Operations.

When generating binary operations, the requested type sent down was the output
type, not the input type.  However, the generator expects the input type to
know how to output the operation.  Fix that.

git-svn-id: https://groke.mcmaster.ca/svn/grad/colin/branches/TableTool_javization@10710 57e6efec-57d4-0310-aeb1-a6c144bb1a8b