Use off-heap data for class check instructions

runtime/vm/jit_optimizer.h

Index: runtime/vm/jit_optimizer.h
diff --git a/runtime/vm/jit_optimizer.h b/runtime/vm/jit_optimizer.h
index 6fe4562056b61165f6ecb2cc4133f8753184b195..b3e06229ebb65fef3655d908a7ea5dcb1a499995 100644
--- a/runtime/vm/jit_optimizer.h
+++ b/runtime/vm/jit_optimizer.h
@@ -74,14 +74,10 @@ class JitOptimizer : public FlowGraphVisitor {
   // environment 'deopt_environment'.  The check is inserted immediately
   // before 'insert_before'.
   void AddCheckClass(Definition* to_check,
-                     const ICData& unary_checks,
+                     const CallTargets& targets,
                      intptr_t deopt_id,
                      Environment* deopt_environment,
                      Instruction* insert_before);
-  Instruction* GetCheckClass(Definition* to_check,
-                             const ICData& unary_checks,
-                             intptr_t deopt_id,
-                             TokenPosition token_pos);
 
   // Insert a Smi check if needed.
   void AddCheckSmi(Definition* to_check,