[Interpreter] Add support for JS calls.

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 ebcb18017e8bf4d1f6da09498ed584a94a48b37f..f7a8dddebd3f77d78cc90ce58264ad3736b3be4e 100644
--- a/src/interpreter/bytecode-array-builder.h
+++ b/src/interpreter/bytecode-array-builder.h
@@ -67,6 +67,13 @@ class BytecodeArrayBuilder {
                                            int feedback_slot,
                                            LanguageMode language_mode);
 
+  // Call a JS function. The JSFunction or Callable to be called should be in
+  // |callable|, the receiver should be in |receiver| and all subsequent
+  // arguments should be in registers <receiver + 1> to
+  // <receiver + 1 + arg_count>.
+  BytecodeArrayBuilder& Call(Register callable, Register receiver,
+                             size_t arg_count);
+
   // Operators.
   BytecodeArrayBuilder& BinaryOperation(Token::Value binop, Register reg);