X87: Handle StepIn for constructors through PrepareStep just like for regular calls.

src/full-codegen/x87/full-codegen-x87.cc

Index: src/full-codegen/x87/full-codegen-x87.cc
diff --git a/src/full-codegen/x87/full-codegen-x87.cc b/src/full-codegen/x87/full-codegen-x87.cc
index 29a277edfa224493a5a315b2cb674b97bfd8a32b..3f4c894c460bf1b0e00e9ac4057ed19df99ffc3f 100644
--- a/src/full-codegen/x87/full-codegen-x87.cc
+++ b/src/full-codegen/x87/full-codegen-x87.cc
@@ -2936,7 +2936,7 @@ void FullCodeGenerator::VisitCallNew(CallNew* expr) {
 
   // Call the construct call builtin that handles allocation and
   // constructor invocation.
-  SetConstructCallPosition(expr);
+  SetConstructCallPosition(expr, arg_count);
 
   // Load function and argument count into edi and eax.
   __ Move(eax, Immediate(arg_count));
@@ -2972,7 +2972,7 @@ void FullCodeGenerator::EmitSuperConstructorCall(Call* expr) {
 
   // Call the construct call builtin that handles allocation and
   // constructor invocation.
-  SetConstructCallPosition(expr);
+  SetConstructCallPosition(expr, arg_count);
 
   // Load new target into ecx.
   VisitForAccumulatorValue(super_call_ref->new_target_var());
@@ -3713,6 +3713,10 @@ void FullCodeGenerator::EmitDefaultConstructorCallSuper(CallRuntime* expr) {
   VisitForStackValue(args->at(0));
   VisitForStackValue(args->at(1));
 
+  // Call the construct call builtin that handles allocation and
+  // constructor invocation.
+  SetConstructCallPosition(expr, 0);
+
   // Check if the calling frame is an arguments adaptor frame.
   Label adaptor_frame, args_set_up, runtime;
   __ mov(edx, Operand(ebp, StandardFrameConstants::kCallerFPOffset));