Introduce FeedbackVectorSlot type - better than int.

src/compiler/js-generic-lowering.cc

 // Copyright 2014 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/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph-inl.h"
 #include "src/compiler/js-generic-lowering.h"
 #include "src/compiler/machine-operator.h"
@@ skipping 257 matching lines @@
 
 void JSGenericLowering::LowerJSToObject(Node* node) {
   ReplaceWithBuiltinCall(node, Builtins::TO_OBJECT, 1);
 }
 
 
 void JSGenericLowering::LowerJSLoadProperty(Node* node) {
   const LoadPropertyParameters& p = LoadPropertyParametersOf(node->op());
   Callable callable = CodeFactory::KeyedLoadICInOptimizedCode(isolate());
   if (FLAG_vector_ics) {
-    PatchInsertInput(node, 2, jsgraph()->SmiConstant(p.feedback().slot()));
+    PatchInsertInput(node, 2,
+                     jsgraph()->SmiConstant(p.feedback().slot().ToInt()));
     PatchInsertInput(node, 3, jsgraph()->HeapConstant(p.feedback().vector()));
   }
   ReplaceWithStubCall(node, callable, CallDescriptor::kPatchableCallSite);
 }
 
 
 void JSGenericLowering::LowerJSLoadNamed(Node* node) {
   const LoadNamedParameters& p = LoadNamedParametersOf(node->op());
   Callable callable =
       CodeFactory::LoadICInOptimizedCode(isolate(), p.contextual_mode());
   PatchInsertInput(node, 1, jsgraph()->HeapConstant(p.name()));
   if (FLAG_vector_ics) {
-    PatchInsertInput(node, 2, jsgraph()->SmiConstant(p.feedback().slot()));
+    PatchInsertInput(node, 2,
+                     jsgraph()->SmiConstant(p.feedback().slot().ToInt()));
     PatchInsertInput(node, 3, jsgraph()->HeapConstant(p.feedback().vector()));
   }
   ReplaceWithStubCall(node, callable, CallDescriptor::kPatchableCallSite);
 }
 
 
 void JSGenericLowering::LowerJSStoreProperty(Node* node) {
   StrictMode strict_mode = OpParameter<StrictMode>(node);
   Callable callable = CodeFactory::KeyedStoreIC(isolate(), strict_mode);
   ReplaceWithStubCall(node, callable, CallDescriptor::kPatchableCallSite);
@@ skipping 98 matching lines @@
 
 
 void JSGenericLowering::LowerJSCallRuntime(Node* node) {
   const CallRuntimeParameters& p = CallRuntimeParametersOf(node->op());
   ReplaceWithRuntimeCall(node, p.id(), static_cast<int>(p.arity()));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8