Always assert in DAGCombine and not only when -debug is	enabled

Right now in DAG Combine check the validity of the returned type 
only when -debug is given on the command line. However usually 
the test cases in the validation does not use -debug. 
An Assert build should always check this.

llvm-svn: 224779
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 7a91aae..5134066 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -787,11 +787,12 @@
         N->dump(&DAG);
         dbgs() << "\nWith: ";
         To[0].getNode()->dump(&DAG);
-        dbgs() << " and " << NumTo-1 << " other values\n";
-        for (unsigned i = 0, e = NumTo; i != e; ++i)
-          assert((!To[i].getNode() ||
-                  N->getValueType(i) == To[i].getValueType()) &&
-                 "Cannot combine value to value of different type!"));
+        dbgs() << " and " << NumTo-1 << " other values\n");
+  for (unsigned i = 0, e = NumTo; i != e; ++i)
+    assert((!To[i].getNode() ||
+            N->getValueType(i) == To[i].getValueType()) &&
+           "Cannot combine value to value of different type!");
+
   WorklistRemover DeadNodes(*this);
   DAG.ReplaceAllUsesWith(N, To);
   if (AddTo) {