[turbofan] Add support for relevant ES6 type conversion intrinsics.

src/compiler/js-intrinsic-lowering.h

Index: src/compiler/js-intrinsic-lowering.h
diff --git a/src/compiler/js-intrinsic-lowering.h b/src/compiler/js-intrinsic-lowering.h
index d33dd8bfa36a23fa6987118b27335f84306fc81d..0e0e6118b137ebb95ffcc196e5d8e6631c1b5bb6 100644
--- a/src/compiler/js-intrinsic-lowering.h
+++ b/src/compiler/js-intrinsic-lowering.h
@@ -10,6 +10,11 @@
 
 namespace v8 {
 namespace internal {
+
+// Forward declarations.
+class TypeCache;
+
+
 namespace compiler {
 
 // Forward declarations.
@@ -57,7 +62,13 @@ class JSIntrinsicLowering final : public AdvancedReducer {
   Reduction ReduceGetTypeFeedbackVector(Node* node);
   Reduction ReduceGetCallerJSFunction(Node* node);
   Reduction ReduceThrowNotDateError(Node* node);
+  Reduction ReduceToInteger(Node* node);
+  Reduction ReduceToLength(Node* node);
+  Reduction ReduceToName(Node* node);
+  Reduction ReduceToNumber(Node* node);
   Reduction ReduceToObject(Node* node);
+  Reduction ReduceToPrimitive(Node* node);
+  Reduction ReduceToString(Node* node);
   Reduction ReduceCallFunction(Node* node);
 
   Reduction Change(Node* node, const Operator* op);
@@ -69,14 +80,17 @@ class JSIntrinsicLowering final : public AdvancedReducer {
 
   Graph* graph() const;
   JSGraph* jsgraph() const { return jsgraph_; }
+  Isolate* isolate() const;
   CommonOperatorBuilder* common() const;
   JSOperatorBuilder* javascript() const;
   MachineOperatorBuilder* machine() const;
   SimplifiedOperatorBuilder* simplified() const;
   DeoptimizationMode mode() const { return mode_; }
+  TypeCache const& type_cache() const { return type_cache_; }
 
   JSGraph* const jsgraph_;
   DeoptimizationMode const mode_;
+  TypeCache const& type_cache_;
 };
 
 }  // namespace compiler