Fix issue #21

• Fixes GCM when anti-dependencies thinks there needs to be an edge from a read to a write that the read doesn't dominate - just don't draw that edge (not necessary since anti-dependencies can be treated as best effort).
• Closes #21 (closed).

requested review from @aaronjc4

assigned to @rarbore2

enabled an automatic merge when all merge checks for ca17e8f1 pass

merged

mentioned in commit 9b3bb526