Handle StepIn for constructors through PrepareStep just like for regular calls

src/arm64/builtins-arm64.cc

Index: src/arm64/builtins-arm64.cc
diff --git a/src/arm64/builtins-arm64.cc b/src/arm64/builtins-arm64.cc
index aa3a28dc5856e309753ca98da2f5cf55e2bfdd34..14472f43049865869f75e3160e04fddc69827374 100644
--- a/src/arm64/builtins-arm64.cc
+++ b/src/arm64/builtins-arm64.cc
@@ -371,12 +371,6 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     // the preconditions is not met, the code bails out to the runtime call.
     Label rt_call, allocated;
     if (FLAG_inline_new) {
-      ExternalReference debug_step_in_fp =
-          ExternalReference::debug_step_in_fp_address(isolate);
-      __ Mov(x2, Operand(debug_step_in_fp));
-      __ Ldr(x2, MemOperand(x2));
-      __ Cbnz(x2, &rt_call);
-
       // Verify that the new target is a JSFunction.
       __ JumpIfNotObjectType(new_target, x10, x11, JS_FUNCTION_TYPE, &rt_call);
 
@@ -697,20 +691,6 @@ void Builtins::Generate_JSConstructStubForDerived(MacroAssembler* masm) {
     __ Drop(1);
     __ Bind(&done_copying_arguments);
 
-    // Handle step in.
-    Label skip_step_in;
-    ExternalReference debug_step_in_fp =
-        ExternalReference::debug_step_in_fp_address(masm->isolate());
-    __ Mov(x2, Operand(debug_step_in_fp));
-    __ Ldr(x2, MemOperand(x2));
-    __ Cbz(x2, &skip_step_in);
-
-    __ Push(x0, x1, x1);
-    __ CallRuntime(Runtime::kHandleStepInForDerivedConstructors, 1);
-    __ Pop(x1, x0);
-
-    __ bind(&skip_step_in);
-
     // Call the function.
     // x0: number of arguments
     // x1: constructor function