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Commit ee592429 authored by Diego Novillo's avatar Diego Novillo
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Fix dominator descendants for unreachable blocks.

When a block is unreachable, asking its dom tree descendants should
return the empty set. However, the computation of the descendants
was causing a segmentation fault because the dom tree node we get
from the basic block is initially NULL.

Fixed by adding a test for a valid dom tree node before we iterate.

The patch also adds some unit tests to the existing dom tree tests.

llvm-svn: 196099
parent c0378e72
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