[Interpreter] Adds support for rest parameters to interpreter.

src/interpreter/interpreter.cc

Index: src/interpreter/interpreter.cc
diff --git a/src/interpreter/interpreter.cc b/src/interpreter/interpreter.cc
index 1d467e300fe3894a9590bac62d03a7ddca173d33..774aeea8abc47cde70a8c1dadc2e06f6ce9e7e6f 100644
--- a/src/interpreter/interpreter.cc
+++ b/src/interpreter/interpreter.cc
@@ -1770,6 +1770,19 @@ void Interpreter::DoCreateUnmappedArguments(
   __ Dispatch();
 }
 
+// CreateRestArguments
+//
+// Creates a new rest arguments object starting at |rest_index|.
+void Interpreter::DoCreateRestArguments(
+    compiler::InterpreterAssembler* assembler) {
+  Node* closure = __ LoadRegister(Register::function_closure());
+  Node* constant_pool_index = __ BytecodeOperandIdx(0);
+  Node* rest_index = __ LoadConstantPoolEntry(constant_pool_index);
+  Node* result =
+      __ CallRuntime(Runtime::kNewRestArguments_Generic, closure, rest_index);
+  __ SetAccumulator(result);
+  __ Dispatch();
+}
 
 // Throw
 //