Fix a QOI issue noticed by Markus F.X.J. Oberhumer.
This fixes PR641


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24154 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/CBackend/CBackend.cpp b/lib/Target/CBackend/CBackend.cpp
index 8ff23b7..7d0c21a 100644
--- a/lib/Target/CBackend/CBackend.cpp
+++ b/lib/Target/CBackend/CBackend.cpp
@@ -1731,6 +1731,7 @@
   PM.add(createLowerGCPass());
   PM.add(createLowerAllocationsPass(true));
   PM.add(createLowerInvokePass());
+  PM.add(createCFGSimplificationPass());   // clean up after lower invoke.
   PM.add(new CBackendNameAllUsedStructs());
   PM.add(new CWriter(o, getIntrinsicLowering()));
   return false;