Revert r110317, and add a comment why the assertion is not an invariant.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@110330 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Checker/GRExprEngine.cpp b/lib/Checker/GRExprEngine.cpp
index d4ee0ef..4ecc75f 100644
--- a/lib/Checker/GRExprEngine.cpp
+++ b/lib/Checker/GRExprEngine.cpp
@@ -236,11 +236,11 @@
   
   // If we built NewCO, check if we called all the checkers.  This is important
   // so that we know that we accurately determined the entire set of checkers
-  // that responds to this callback.
-  if (NewCO.get()) { 
-    assert(checkersEvaluated == Checkers.size());
+  // that responds to this callback.  Note that 'checkersEvaluated' might
+  // not be the same as Checkers.size() if one of the Checkers generates
+  // a sink node.
+  if (NewCO.get() && checkersEvaluated == Checkers.size())
     CO_Ref = NewCO.take();
-  }
 
   // Don't autotransition.  The CheckerContext objects should do this
   // automatically.