Reland "Use off-heap data for type feedback in PolymorphicInstanceCallInstr"

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 23dd278db3d4671297dfbe95918f6e5a72f8ef35..6fe4562056b61165f6ecb2cc4133f8753184b195 100644
--- a/runtime/vm/jit_optimizer.h
+++ b/runtime/vm/jit_optimizer.h
@@ -52,12 +52,6 @@ class JitOptimizer : public FlowGraphVisitor {
 
   bool TryReplaceWithIndexedOp(InstanceCallInstr* call);
 
-  void TryExpandClassesInICData(const ICData& ic_data);
-  bool LookupMethodFor(int class_id,
-                       const ArgumentsDescriptor& args_desc,
-                       const String& name,
-                       Function* fn_return);
-
   bool TryReplaceWithBinaryOp(InstanceCallInstr* call, Token::Kind op_kind);
   bool TryReplaceWithUnaryOp(InstanceCallInstr* call, Token::Kind op_kind);