X87: new classes: no longer experimental.

port 2707d4c9 (r26628).

original commit message:

   This CL fixes tests that no longer valid and also fixes two issues:
    1. 'super()' in non derived constructors.
    2. Failure to step into derived constructors.

BUG=

Review URL: https://codereview.chromium.org/920543005

Cr-Commit-Position: refs/heads/master@{#26647}

src/x87/builtins-x87.cc

@@ -539,6 +539,25 @@ void Builtins::Generate_JSConstructStubForDerived(MacroAssembler* masm) {
     __ j(greater_equal, &loop);
 
     __ inc(eax);  // Pushed new.target.
+
+
+    // Handle step in.
+    Label skip_step_in;
+    ExternalReference debug_step_in_fp =
+        ExternalReference::debug_step_in_fp_address(masm->isolate());
+    __ cmp(Operand::StaticVariable(debug_step_in_fp), Immediate(0));
+    __ j(equal, &skip_step_in);
+
+    __ push(eax);
+    __ push(edi);
+    __ push(edi);
+    __ CallRuntime(Runtime::kHandleStepInForDerivedConstructors, 1);
+    __ pop(edi);
+    __ pop(eax);
+
+    __ bind(&skip_step_in);
+
+    // Invoke function.
     ParameterCount actual(eax);
     __ InvokeFunction(edi, actual, CALL_FUNCTION, NullCallWrapper());
 

src/x87/full-codegen-x87.cc

@@ -3120,6 +3120,8 @@ void FullCodeGenerator::VisitCallNew(CallNew* expr) {
 
 
 void FullCodeGenerator::EmitSuperConstructorCall(Call* expr) {
+  if (!ValidateSuperCall(expr)) return;
+
   Variable* new_target_var = scope()->DeclarationScope()->new_target_var();
   GetVar(eax, new_target_var);
   __ push(eax);
@@ -4085,6 +4087,7 @@ void FullCodeGenerator::EmitDefaultConstructorCallSuper(CallRuntime* expr) {
   }
 
   __ bind(&args_set_up);
+
   __ mov(edi, Operand(esp, eax, times_pointer_size, 0));
 
   CallConstructStub stub(isolate(), SUPER_CONSTRUCTOR_CALL);