new classes: implement new.target passing to superclass constructor.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index a60d9d3c2610a894bed8677d40c953d753172e6e..20904351162bbdab7fe97b673395eaadc58edbaf 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -1592,8 +1592,13 @@ class ArgumentsAccessStub: public PlatformCodeStub {
     NEW_STRICT
   };
 
-  ArgumentsAccessStub(Isolate* isolate, Type type) : PlatformCodeStub(isolate) {
-    minor_key_ = TypeBits::encode(type);
+  enum HasNewTarget { NO_NEW_TARGET, HAS_NEW_TARGET };
+
+  ArgumentsAccessStub(Isolate* isolate, Type type,
+                      HasNewTarget has_new_target = NO_NEW_TARGET)
+      : PlatformCodeStub(isolate) {
+    minor_key_ =
+        TypeBits::encode(type) | HasNewTargetBits::encode(has_new_target);
   }
 
   CallInterfaceDescriptor GetCallInterfaceDescriptor() OVERRIDE {
@@ -1605,6 +1610,9 @@ class ArgumentsAccessStub: public PlatformCodeStub {
 
  private:
   Type type() const { return TypeBits::decode(minor_key_); }
+  bool has_new_target() const {
+    return HasNewTargetBits::decode(minor_key_) == HAS_NEW_TARGET;
+  }
 
   void GenerateReadElement(MacroAssembler* masm);
   void GenerateNewStrict(MacroAssembler* masm);
@@ -1614,6 +1622,7 @@ class ArgumentsAccessStub: public PlatformCodeStub {
   void PrintName(std::ostream& os) const OVERRIDE;  // NOLINT
 
   class TypeBits : public BitField<Type, 0, 2> {};
+  class HasNewTargetBits : public BitField<HasNewTarget, 2, 1> {};
 
   DEFINE_PLATFORM_CODE_STUB(ArgumentsAccess, PlatformCodeStub);
 };
@@ -1695,9 +1704,13 @@ class CallConstructStub: public PlatformCodeStub {
     return (flags() & RECORD_CONSTRUCTOR_TARGET) != 0;
   }
 
+  bool IsSuperConstructorCall() const {
+    return (flags() & SUPER_CONSTRUCTOR_CALL) != 0;
+  }
+
   void PrintName(std::ostream& os) const OVERRIDE;  // NOLINT
 
-  class FlagBits : public BitField<CallConstructorFlags, 0, 1> {};
+  class FlagBits : public BitField<CallConstructorFlags, 0, 2> {};
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(CallConstruct);
   DEFINE_PLATFORM_CODE_STUB(CallConstruct, PlatformCodeStub);