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Compute dominators of a control-flow graph.

The Dominance Relation

In a directed graph with a root node R, a node A is said to dominate a node B iff every path from R to B contains A.

The node A is said to strictly dominate the node B iff A dominates B and A ≠ B.

The node A is said to be the immediate dominator of a node B iff it strictly dominates B and there does not exist any node C where A dominates C and C dominates B.