Fix case where it fails to identify unrolled reductions

Also removed prematurely-added test

Author: NickGuy-Arm

llvm/lib/CodeGen/ComplexDeinterleavingPass.cpp

@@ -1546,11 +1546,10 @@ void ComplexDeinterleavingGraph::identifyReductionNodes() {
   for (size_t i = 0; i < OperationInstruction.size(); ++i) {
     if (Processed[i])
       continue;
-    auto *Real = OperationInstruction[i];
     for (size_t j = i + 1; j < OperationInstruction.size(); ++j) {
       if (Processed[j])
         continue;
-
+      auto *Real = OperationInstruction[i];
       auto *Imag = OperationInstruction[j];
       if (Real->getType() != Imag->getType())
         continue;
@@ -1583,6 +1582,7 @@ void ComplexDeinterleavingGraph::identifyReductionNodes() {
       }
     }
 
+    auto *Real = OperationInstruction[i];
     // We want to check that we have 2 operands, but the function attributes
     // being counted as operands bloats this value.
     if (Real->getNumOperands() < 2)