[interpreter] Switch passing of new.target to register.

src/interpreter/bytecodes.cc

Index: src/interpreter/bytecodes.cc
diff --git a/src/interpreter/bytecodes.cc b/src/interpreter/bytecodes.cc
index 86964c7e6f9274a2122e71027d695a464f012df1..74b8904b29f91872d3c62001984ce6ba1c5bad47 100644
--- a/src/interpreter/bytecodes.cc
+++ b/src/interpreter/bytecodes.cc
@@ -228,6 +228,8 @@ std::ostream& Bytecodes::Decode(std::ostream& os, const uint8_t* bytecode_start,
           os << "<context>";
         } else if (reg.is_function_closure()) {
           os << "<closure>";
+        } else if (reg.is_new_target()) {
+          os << "<new.target>";
         } else if (reg.is_parameter()) {
           int parameter_index = reg.ToParameterIndex(parameter_count);
           if (parameter_index == 0) {
@@ -273,6 +275,8 @@ static const int kFunctionClosureRegisterIndex =
     -InterpreterFrameConstants::kFunctionFromRegisterPointer / kPointerSize;
 static const int kFunctionContextRegisterIndex =
     -InterpreterFrameConstants::kContextFromRegisterPointer / kPointerSize;
+static const int kNewTargetRegisterIndex =
+    -InterpreterFrameConstants::kNewTargetFromRegisterPointer / kPointerSize;
 
 
 // Registers occupy range 0-127 in 8-bit value leaving 128 unused values.
@@ -318,6 +322,14 @@ bool Register::is_function_context() const {
 }
 
 
+Register Register::new_target() { return Register(kNewTargetRegisterIndex); }
+
+
+bool Register::is_new_target() const {
+  return index() == kNewTargetRegisterIndex;
+}
+
+
 int Register::MaxParameterIndex() { return kMaxParameterIndex; }