Re-enable fail_compile/fail141 now that SymOffExp is back in.
Disable test failing due to slightly different error message.
Disable test for ModuleInfo conflcit bug that was not actually fixed.

See the linked GitHub issue for details – the patch made it
only so that a Module::moduleinfo declaration pointing to
user code is no longer detected.
-transition is not supported by LDC yet.
Disable diag6717, our iasm diagnostic is slightly different.