In optimized code use IC calls for instance calls that have no IC data instead of deoptimizing. The…

runtime/vm/flow_graph_compiler_x64.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "lib/error.h"
@@ skipping 1028 matching lines @@
 
 void FlowGraphCompiler::GenerateCallRuntime(intptr_t token_pos,
                                             const RuntimeEntry& entry,
                                             LocationSummary* locs) {
   __ CallRuntime(entry);
   AddCurrentDescriptor(PcDescriptors::kOther, Isolate::kNoDeoptId, token_pos);
   RecordSafepoint(locs);
 }
 
 
+void FlowGraphCompiler::EmitOptimizedInstanceCall(
+    ExternalLabel* target_label,
+    const ICData& ic_data,
+    const Array& arguments_descriptor,
+    intptr_t argument_count,
+    intptr_t deopt_id,
+    intptr_t token_pos,
+    LocationSummary* locs) {
+  // Load top function since it may not correspond to the ICData function.
+  __ LoadObject(RDI, parsed_function().function());
+  __ LoadObject(RBX, ic_data);
+  __ LoadObject(R10, arguments_descriptor);
+  GenerateDartCall(deopt_id,
+                   token_pos,
+                   target_label,
+                   PcDescriptors::kIcCall,
+                   locs);
+  __ Drop(argument_count);
+}
+
+
 void FlowGraphCompiler::EmitInstanceCall(ExternalLabel* target_label,
                                          const ICData& ic_data,
                                          const Array& arguments_descriptor,
                                          intptr_t argument_count,
                                          intptr_t deopt_id,
                                          intptr_t token_pos,
                                          LocationSummary* locs) {
   __ LoadObject(RBX, ic_data);
   __ LoadObject(R10, arguments_descriptor);
   GenerateDartCall(deopt_id,
@@ skipping 278 matching lines @@
 void ParallelMoveResolver::Exchange(const Address& mem1, const Address& mem2) {
   __ Exchange(mem1, mem2);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64