Added test cases

Author: kumasento

tools/polymer/test/polymer-opt/Reg2Mem/aes.mlir

@@ -0,0 +1,14 @@
+
+
+// a = A[i]; A[i] *= a; A[i] += a;
+func @foo(%A: memref<10xf32>) {
+  affine.for %i = 0 to 10 {
+    %0 = affine.load %A[%i] : memref<10xf32>
+    %1 = mulf %0, %0 : f32
+    affine.store %1, %A[%i] : memref<10xf32>
+    // Should replace %0 by a load from a scratchpad.
+    %2 = addf %1, %0 : f32
+    affine.store %2, %A[%i] : memref<10xf32>
+  }
+  return
+}