[Interpreter] Adds support for rest parameters to interpreter.

src/interpreter/bytecode-array-builder.h

Index: src/interpreter/bytecode-array-builder.h
diff --git a/src/interpreter/bytecode-array-builder.h b/src/interpreter/bytecode-array-builder.h
index 394bb1dc23c8a338496390e9583205e751ea4b5b..a35b9635a097363a481cd14e735b2e90b42e8366 100644
--- a/src/interpreter/bytecode-array-builder.h
+++ b/src/interpreter/bytecode-array-builder.h
@@ -145,6 +145,9 @@ class BytecodeArrayBuilder final : private RegisterMover {
   // Create a new arguments object in the accumulator.
   BytecodeArrayBuilder& CreateArguments(CreateArgumentsType type);
 
+  // Create a new rest arguments object starting at |index| in the accumulator.
+  BytecodeArrayBuilder& CreateRestArguments(int index);
+
   // Literals creation.  Constant elements should be in the accumulator.
   BytecodeArrayBuilder& CreateRegExpLiteral(Handle<String> pattern,
                                             int literal_index, int flags);