Typo in checker test : VecMull -> VecMul

Test: 550
Change-Id: Ibf845bb9e08eba8aebde01f8adb47d22a99e1237
diff --git a/test/550-checker-multiply-accumulate/src/Main.java b/test/550-checker-multiply-accumulate/src/Main.java
index 810f0fa..6fd9cdd 100644
--- a/test/550-checker-multiply-accumulate/src/Main.java
+++ b/test/550-checker-multiply-accumulate/src/Main.java
@@ -434,7 +434,7 @@
   /// CHECK-DAG:     VecMultiplyAccumulate kind:Add loop:<<Loop>>      outer_loop:none
 
   /// CHECK-START-ARM64: void Main.SimdMulAdd(int[], int[]) instruction_simplifier_arm64 (after)
-  /// CHECK-NOT:     VecMull
+  /// CHECK-NOT:     VecMul
   /// CHECK-NOT:     VecAdd
   public static void SimdMulAdd(int[] array1, int[] array2) {
     for (int j = 0; j < 100; j++) {
@@ -452,7 +452,7 @@
   /// CHECK-DAG:     VecMultiplyAccumulate kind:Sub loop:<<Loop>>      outer_loop:none
 
   /// CHECK-START-ARM64: void Main.SimdMulSub(int[], int[]) instruction_simplifier_arm64 (after)
-  /// CHECK-NOT:     VecMull
+  /// CHECK-NOT:     VecMul
   /// CHECK-NOT:     VecSub
   public static void SimdMulSub(int[] array1, int[] array2) {
     for (int j = 0; j < 100; j++) {