Fix incorrect escape in Checker assertion in test 660-checker-simd-sad.

Checker was seemingly fine with these when run with Python 2, but they
are tripping it when run with Python 3.

Test: art/test/testrunner/testrunner.py --host --64 --optimizing \
        -t 660-checker-simd-sad
Bug: 170308859
Change-Id: I4e2c121008717d4b1aab59f8b4c3048a2cdc95c2
diff --git a/test/660-checker-simd-sad/src/SimdSadShort2.java b/test/660-checker-simd-sad/src/SimdSadShort2.java
index 020d8d8..b1b5bed 100644
--- a/test/660-checker-simd-sad/src/SimdSadShort2.java
+++ b/test/660-checker-simd-sad/src/SimdSadShort2.java
@@ -158,8 +158,8 @@
   /// CHECK-DAG: <<Cons1:i\d+>>  IntConstant 1                  loop:none
   /// CHECK-DAG: <<Phi2:i\d+>>   Phi [<<Cons0>>,{{i\d+}}]       loop:<<Loop:B\d+>> outer_loop:none
   /// CHECK-DAG: <<Phi1:i\d+>>   Phi [<<Cons0>>,{{i\d+}}]       loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<BC1:\i\d+>>   BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<BC2:\i\d+>>   BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>      outer_loop:none
+  /// CHECK-DAG: <<BC1:i\d+>>    BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>      outer_loop:none
+  /// CHECK-DAG: <<BC2:i\d+>>    BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG: <<Get1:c\d+>>   ArrayGet [{{l\d+}},<<BC1>>]    loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG: <<Get2:c\d+>>   ArrayGet [{{l\d+}},<<BC2>>]    loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG: <<Cnv1:s\d+>>   TypeConversion [<<Get1>>]      loop:<<Loop>>      outer_loop:none
@@ -211,8 +211,8 @@
   /// CHECK-DAG: <<ConsL:j\d+>>  LongConstant 0                 loop:none
   /// CHECK-DAG: <<Phi1:i\d+>>   Phi [<<Cons0>>,{{i\d+}}]       loop:<<Loop:B\d+>> outer_loop:none
   /// CHECK-DAG: <<Phi2:j\d+>>   Phi [<<ConsL>>,{{j\d+}}]       loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<BC1:\i\d+>>   BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>     outer_loop:none
-  /// CHECK-DAG: <<BC2:\i\d+>>   BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>     outer_loop:none
+  /// CHECK-DAG: <<BC1:i\d+>>    BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>     outer_loop:none
+  /// CHECK-DAG: <<BC2:i\d+>>    BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>     outer_loop:none
   /// CHECK-DAG: <<Get1:c\d+>>   ArrayGet [{{l\d+}},<<BC1>>]    loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG: <<Get2:c\d+>>   ArrayGet [{{l\d+}},<<BC2>>]    loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG: <<Cnv1:s\d+>>   TypeConversion [<<Get1>>]      loop:<<Loop>>      outer_loop:none
@@ -267,8 +267,8 @@
   /// CHECK-DAG: <<ConsL:j\d+>>  LongConstant 1                 loop:none
   /// CHECK-DAG: <<Phi1:i\d+>>   Phi [<<Cons0>>,{{i\d+}}]       loop:<<Loop:B\d+>> outer_loop:none
   /// CHECK-DAG: <<Phi2:j\d+>>   Phi [<<ConsL>>,{{j\d+}}]       loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<BC1:\i\d+>>   BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>     outer_loop:none
-  /// CHECK-DAG: <<BC2:\i\d+>>   BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>     outer_loop:none
+  /// CHECK-DAG: <<BC1:i\d+>>    BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>     outer_loop:none
+  /// CHECK-DAG: <<BC2:i\d+>>    BoundsCheck [<<Phi1>>,{{i\d+}}] loop:<<Loop>>     outer_loop:none
   /// CHECK-DAG: <<Get1:c\d+>>   ArrayGet [{{l\d+}},<<BC1>>]    loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG: <<Get2:c\d+>>   ArrayGet [{{l\d+}},<<BC2>>]    loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG: <<Cnv1:s\d+>>   TypeConversion [<<Get1>>]      loop:<<Loop>>      outer_loop:none