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

runtime/vm/code_patcher_ia32.cc

Index: runtime/vm/code_patcher_ia32.cc
diff --git a/runtime/vm/code_patcher_ia32.cc b/runtime/vm/code_patcher_ia32.cc
index d0a4f07c921567cfdccb94d8509e193ee82b70e8..90f187659b5d6d71cd6df91b2d1ab197ebbe7825 100644
--- a/runtime/vm/code_patcher_ia32.cc
+++ b/runtime/vm/code_patcher_ia32.cc
@@ -211,6 +211,16 @@ RawFunction* CodePatcher::GetUnoptimizedStaticCallAt(
 }
 
 
+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,