[PATCH] [FIX] Teach RegionGenerator to respect and update dominance

[Tobias Grosser]

LGTM


================
Comment at: lib/CodeGen/BlockGenerators.cpp:115
@@ -114,3 +114,2 @@
-
         BBMap[Old] = Expanded;
         return Expanded;
----------------
This seems unrelated.

http://reviews.llvm.org/D7942

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