#3 Demonstrate LBAC functionality

[Jason Rafe Miller]

Create a unit test for the unitigger. The test should demonstrate that the
LBAC features works as advertized. Actually, we should (formally)
advertize what the LBAC feature does.

[Sergey Koren]

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The LBAC type and functionality has been removed from the assembler. This request is no longer relevant.