[Interpreter] TurboFan implementation of intrinsics.

src/compiler/interpreter-assembler.h

Index: src/compiler/interpreter-assembler.h
diff --git a/src/compiler/interpreter-assembler.h b/src/compiler/interpreter-assembler.h
index fb79d3eaa2ff2a506faf3cb3cbd2e6f91b767b74..e8995a4903231aa396864efbff5502a5996bc25d 100644
--- a/src/compiler/interpreter-assembler.h
+++ b/src/compiler/interpreter-assembler.h
@@ -140,6 +140,9 @@ class InterpreterAssembler {
   Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1, Node* arg2,
                     Node* arg3, Node* arg4);
 
+  // Optimization for a few supported intrinsics taking only one argument.
+  Node* IntrinsicOneArg(Node* function_id, Node* arg);
+
   // Jump relative to the current bytecode by |jump_offset|.
   void Jump(Node* jump_offset);
 
@@ -195,6 +198,11 @@ class InterpreterAssembler {
   Node* Advance(int delta);
   Node* Advance(Node* delta);
 
+  // Helper methods to deal with IntrinsicOneArg.
+  Node* ToBoolean(Node* arg);
+  Node* IsJSReceiver(Node* arg);
+  Node* IsJSArray(Node* arg);
+
   // Starts next instruction dispatch at |new_bytecode_offset|.
   void DispatchTo(Node* new_bytecode_offset);