[GVNHoist] Fix typo in assert.

This fixes PR28730.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276844 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/GVNHoist.cpp

@@ -74,7 +74,7 @@ struct SortByDFSIn {
 
     unsigned ADFS = DFSNumber.lookup(A);
     unsigned BDFS = DFSNumber.lookup(B);
-    assert (ADFS && ADFS);
+    assert (ADFS && BDFS);
     return ADFS < BDFS;
   }
 };