Fix lazy deoptimization from deferred code.

runtime/vm/instructions_arm64.h

Index: runtime/vm/instructions_arm64.h
diff --git a/runtime/vm/instructions_arm64.h b/runtime/vm/instructions_arm64.h
index 34bc3326d12dc8f6946fdeeb2948114b05e52a66..0d2c96d70ceba0d775b65f631bd78f6504fa8c63 100644
--- a/runtime/vm/instructions_arm64.h
+++ b/runtime/vm/instructions_arm64.h
@@ -66,7 +66,9 @@ class CallPattern : public ValueObject {
 
   // This constant length is only valid for inserted call patterns used for
   // lazy deoptimization. Regular call pattern may vary in length.
-  static const int kDeoptCallLengthInBytes = 5 * Instr::kInstrSize;
+  static const int kDeoptCallLengthInInstructions = 5;
+  static const int kDeoptCallLengthInBytes =
+      kDeoptCallLengthInInstructions * Instr::kInstrSize;
 
   static void InsertDeoptCallAt(uword pc, uword target_address);