[Cloning] Teach CloneModule about personality functions

CloneModule didn't take into account that it needed to remap the value
using values in the module.

This fixes PR23992.

llvm-svn: 241122
diff --git a/llvm/lib/Transforms/Utils/CloneModule.cpp b/llvm/lib/Transforms/Utils/CloneModule.cpp
index 2693322..61f1811 100644
--- a/llvm/lib/Transforms/Utils/CloneModule.cpp
+++ b/llvm/lib/Transforms/Utils/CloneModule.cpp
@@ -99,7 +99,11 @@
 
       SmallVector<ReturnInst*, 8> Returns;  // Ignore returns cloned.
       CloneFunctionInto(F, I, VMap, /*ModuleLevelChanges=*/true, Returns);
+
     }
+
+    if (I->hasPersonalityFn())
+      F->setPersonalityFn(MapValue(I->getPersonalityFn(), VMap));
   }
 
   // And aliases