[Turbofan] Implement super calls with spread bytecode in assembly code.

src/interpreter/interpreter.cc

Index: src/interpreter/interpreter.cc
diff --git a/src/interpreter/interpreter.cc b/src/interpreter/interpreter.cc
index 60c5e595afa004eb8f1e4d1b5f1126492d376cee..942d233ee5c1f67d50ecdc6c48cff42f69fbb776 100644
--- a/src/interpreter/interpreter.cc
+++ b/src/interpreter/interpreter.cc
@@ -2159,22 +2159,22 @@ void Interpreter::DoCallJSRuntime(InterpreterAssembler* assembler) {
   __ Dispatch();
 }
 
-// NewWithSpread <first_arg> <arg_count>
+// NewWithSpread <constructor> <first_arg> <arg_count>
 //
-// Call the constructor in |first_arg| with the new.target in |first_arg + 1|
-// for the |arg_count - 2| following arguments. The final argument is always a
-// spread.
+// Call the constructor in |constructor| with the first argument in register
+// |first_arg| and |arg_count| arguments in subsequent registers. The final
+// argument is always a spread. The new.target is in the accumulator.
 //
 void Interpreter::DoNewWithSpread(InterpreterAssembler* assembler) {
-  Node* first_arg_reg = __ BytecodeOperandReg(0);
+  Node* new_target = __ GetAccumulator();
+  Node* constructor_reg = __ BytecodeOperandReg(0);
+  Node* constructor = __ LoadRegister(constructor_reg);
+  Node* first_arg_reg = __ BytecodeOperandReg(1);
   Node* first_arg = __ RegisterLocation(first_arg_reg);
-  Node* args_count = __ BytecodeOperandCount(1);
+  Node* args_count = __ BytecodeOperandCount(2);
   Node* context = __ GetContext();
-
-  // Call into Runtime function NewWithSpread which does everything.
-  Node* runtime_function = __ Int32Constant(Runtime::kNewWithSpread);
-  Node* result =
-      __ CallRuntimeN(runtime_function, context, first_arg, args_count);
+  Node* result = __ CallConstructWithSpread(constructor, context, new_target,
+                                            first_arg, args_count);
   __ SetAccumulator(result);
   __ Dispatch();
 }