Precompilation: Generate instance calls as IC calls that can switch to Megamoprhic calls.

runtime/vm/code_patcher_ia32.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_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/assembler.h"
 #include "vm/code_patcher.h"
 #include "vm/cpu.h"
@@ skipping 193 matching lines @@
   UnoptimizedStaticCall static_call(return_address);
   ICData& ic_data = ICData::Handle();
   ic_data ^= static_call.ic_data();
   if (ic_data_result != NULL) {
     *ic_data_result = ic_data.raw();
   }
   return ic_data.GetTargetAt(0);
 }
 
 
+void CodePatcher::PatchSwitchableCallAt(uword return_address,
+                                        const Code& code,
+                                        const ICData& ic_data,
+                                        const MegamorphicCache& cache,
+                                        const Code& lookup_stub) {
+  // Switchable instance calls only generated for precompilation.
+  UNREACHABLE();
+}
+
+
 void CodePatcher::PatchNativeCallAt(uword return_address,
                                     const Code& code,
                                     NativeFunction target,
                                     const Code& trampoline) {
   UNREACHABLE();
 }
 
 
 RawCode* CodePatcher::GetNativeCallAt(uword return_address,
                                       const Code& code,
                                       NativeFunction* target) {
   UNREACHABLE();
   return NULL;
 }
 
 
 
 intptr_t CodePatcher::InstanceCallSizeInBytes() {
   return InstanceCall::kPatternSize;
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32