Bug fix by Jonathan Neuschäfer: "Without this patch

NotExpr::computeHash() will have a local variable with the name
"hashValue" and assign the newly computed hash to that instead of the
member variable with the same name that should be set by the
computeHash method of every Expr subclass."

git-svn-id: https://llvm.org/svn/llvm-project/klee/trunk@186102 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Expr/Expr.cpp

@@ -257,7 +257,7 @@ unsigned ReadExpr::computeHash() {
 }
 
 unsigned NotExpr::computeHash() {
-  unsigned hashValue = expr->hash() * Expr::MAGIC_HASH_CONSTANT * Expr::Not;
+  hashValue = expr->hash() * Expr::MAGIC_HASH_CONSTANT * Expr::Not;
   return hashValue;
 }