[interpreter] Add CreateFunctionContext bytecode

src/interpreter/interpreter.cc

 // Copyright 2015 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/interpreter/interpreter.h"
 
 #include <fstream>
 #include <memory>
 
 #include "src/ast/prettyprinter.h"
@@ skipping 1699 matching lines @@
     Node* tenured_raw = __ Word32And(
         flags, __ Int32Constant(CreateClosureFlags::PretenuredBit::kMask));
     Node* tenured = __ SmiTag(tenured_raw);
     Node* result = __ CallRuntime(Runtime::kInterpreterNewClosure, context,
                                   shared, tenured);
     __ SetAccumulator(result);
     __ Dispatch();
   }
 }
 
+// CreateContext
+//
+// Creates a new context for the function closure in the accumulator.
+void Interpreter::DoCreateFunctionContext(InterpreterAssembler* assembler) {
+  Node* closure = __ LoadRegister(Register::function_closure());
+  Node* slots = __ BytecodeOperandImm(0);
+  Node* context = __ GetContext();
+  __ SetAccumulator(
+      FastNewFunctionContextStub::Generate(assembler, closure, slots, context));
+  __ Dispatch();
+}
+
 // CreateMappedArguments
 //
 // Creates a new mapped arguments object.
 void Interpreter::DoCreateMappedArguments(InterpreterAssembler* assembler) {
   Node* closure = __ LoadRegister(Register::function_closure());
   Node* context = __ GetContext();
 
   Label if_duplicate_parameters(assembler, Label::kDeferred);
   Label if_not_duplicate_parameters(assembler);
 
@@ skipping 438 matching lines @@
   __ StoreObjectField(generator, JSGeneratorObject::kContinuationOffset,
       __ SmiTag(new_state));
   __ SetAccumulator(old_state);
 
   __ Dispatch();
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8