Fix http://dartbug.com/23578:

runtime/vm/intrinsifier_arm64.cc

Index: runtime/vm/intrinsifier_arm64.cc
diff --git a/runtime/vm/intrinsifier_arm64.cc b/runtime/vm/intrinsifier_arm64.cc
index 9e44953e75320cca0fcfcefe66f6ec096de32b26..fedbe17236dfc543157c04634e21194abae71a56 100644
--- a/runtime/vm/intrinsifier_arm64.cc
+++ b/runtime/vm/intrinsifier_arm64.cc
@@ -48,7 +48,7 @@ static intptr_t ComputeObjectArrayTypeArgumentsOffset() {
 void Intrinsifier::ObjectArraySetIndexed(Assembler* assembler) {
   Label fall_through;
 
-  if (Isolate::Current()->TypeChecksEnabled()) {
+  if (Isolate::Current()->flags().type_checks()) {
     const intptr_t type_args_field_offset =
         ComputeObjectArrayTypeArgumentsOffset();
     // Inline simple tests (Smi, null), fallthrough if not positive.
@@ -149,7 +149,7 @@ void Intrinsifier::GrowableArray_Allocate(Assembler* assembler) {
 // On stack: growable array (+1), value (+0).
 void Intrinsifier::GrowableArray_add(Assembler* assembler) {
   // In checked mode we need to type-check the incoming argument.
-  if (Isolate::Current()->TypeChecksEnabled()) {
+  if (Isolate::Current()->flags().type_checks()) {
     return;
   }
   Label fall_through;