Index: lib/CodeGen/MachineBlockPlacement.cpp
===================================================================
--- lib/CodeGen/MachineBlockPlacement.cpp
+++ lib/CodeGen/MachineBlockPlacement.cpp
@@ -2650,6 +2650,7 @@
   }
 
   assert(BlockToChain.empty());
+  assert(ComputedEdges.empty());
 
   buildCFGChains();
 
@@ -2683,6 +2684,7 @@
   alignBlocks();
 
   BlockToChain.clear();
+  ComputedEdges.clear();
   ChainAllocator.DestroyAll();
 
   if (AlignAllBlock)