Handle StepIn for constructors through PrepareStep just like for regular calls

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index 8571f33176033797785d6dfc20abab9f88f7e57f..a9e56576767fdb6d72a70fcffe77626903b32e29 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -521,7 +521,8 @@ void RelocInfoWriter::Write(const RelocInfo* rinfo) {
       WriteData(rinfo->data());
     } else if (RelocInfo::IsConstPool(rmode) ||
                RelocInfo::IsVeneerPool(rmode) ||
-               RelocInfo::IsDebugBreakSlotAtCall(rmode)) {
+               RelocInfo::IsDebugBreakSlotAtCall(rmode) ||
+               RelocInfo::IsDebugBreakSlotAtConstructCall(rmode)) {
       WriteIntData(static_cast<int>(rinfo->data()));
     }
   }
@@ -713,7 +714,8 @@ void RelocIterator::next() {
           }
         } else if (RelocInfo::IsConstPool(rmode) ||
                    RelocInfo::IsVeneerPool(rmode) ||
-                   RelocInfo::IsDebugBreakSlotAtCall(rmode)) {
+                   RelocInfo::IsDebugBreakSlotAtCall(rmode) ||
+                   RelocInfo::IsDebugBreakSlotAtConstructCall(rmode)) {
           if (SetMode(rmode)) {
             AdvanceReadInt();
             return;