fix uninitialized data from bad default constructor

include/Analysis/RotationAnalysis/RotationAnalysis.h

@@ -19,11 +19,12 @@ namespace rotation_analysis {
 // A wrapper around a mapping from tensor SSA values to sets of access indices
 class RotationSets {
  public:
-  RotationSets() = default;
-  ~RotationSets() = default;
-
   enum class Status { Normal, TooManyTensors };
 
+ public:
+  RotationSets() : status(Status::Normal){};
+  ~RotationSets() = default;
+
   // Clear the member data, i.e., set the value back to an uninitialized
   // state.
   void clear() {
@@ -99,6 +100,10 @@ class RotationSets {
     if (lhs.accessedIndices.empty()) return rhs;
 
     if (lhs.tensor != rhs.tensor) {
+      LLVM_DEBUG({
+        llvm::dbgs() << "Joining rotations of different tensors: " << lhs.tensor
+                     << " and " << rhs.tensor << "\n";
+      });
       return overdetermined();
     }