ART: Introduce Uint8 loads in compiled code.

Some vectorization patterns are not recognized anymore.
This shall be fixed later.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Test: testrunner.py --target --optimizing on Nexus 5X
Test: Nexus 5X boots.
Bug: 23964345
Bug: 67935418
Change-Id: I587a328d4799529949c86fa8045c6df21e3a8617
diff --git a/compiler/optimizing/nodes_vector.h b/compiler/optimizing/nodes_vector.h
index 781a59f..4e78e4e 100644
--- a/compiler/optimizing/nodes_vector.h
+++ b/compiler/optimizing/nodes_vector.h
@@ -943,8 +943,8 @@
     DCHECK(HasConsistentPackedTypes(accumulator, packed_type));
     DCHECK(sad_left->IsVecOperation());
     DCHECK(sad_right->IsVecOperation());
-    DCHECK_EQ(sad_left->AsVecOperation()->GetPackedType(),
-              sad_right->AsVecOperation()->GetPackedType());
+    DCHECK_EQ(ToSignedType(sad_left->AsVecOperation()->GetPackedType()),
+              ToSignedType(sad_right->AsVecOperation()->GetPackedType()));
     SetRawInputAt(0, accumulator);
     SetRawInputAt(1, sad_left);
     SetRawInputAt(2, sad_right);