[turbofan] Add an InterpreterDispatch linkage type.

src/compiler/code-generator.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/pipeline.h"
 #include "src/snapshot/serialize.h"  // TODO(turbofan): RootIndexMap
@@ skipping 227 matching lines @@
       *offset_return = JavaScriptFrameConstants::kFunctionOffset;
       return true;
     }
   }
   return false;
 }
 
 
 bool CodeGenerator::IsMaterializableFromRoot(
     Handle<HeapObject> object, Heap::RootListIndex* index_return) {
-  if (linkage()->GetIncomingDescriptor()->IsJSFunctionCall()) {
+  const CallDescriptor* incoming_descriptor =
+      linkage()->GetIncomingDescriptor();
+  if (incoming_descriptor->IsJSFunctionCall() ||
+      incoming_descriptor->IsInterpreterDispatch()) {
     RootIndexMap map(isolate());
     int root_index = map.Lookup(*object);
     if (root_index != RootIndexMap::kInvalidRootIndex) {
       *index_return = static_cast<Heap::RootListIndex>(root_index);
       return true;
     }
   }
   return false;
 }
 
@@ skipping 453 matching lines @@
     : masm_(gen->masm()), next_(gen->ools_) {
   gen->ools_ = this;
 }
 
 
 OutOfLineCode::~OutOfLineCode() {}
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8