search for: update_mir_test_check

...ed a block for those. They're used far less often than classes though, so I think its fine to just let them have their own block when any of them are set. - Basically every single MIR test will need to be updated, and its awkward to do automatically unless the test is already using the update_mir_test_checks script. I plan to implement this in a couple of steps: 1. Teach the MIRPrinter to print the regclass and update test checks 2. Modify existing tests to never provide the registers block 3. Move preferred-registers to their own block and remove the registers block A patch for step 1 is attached...