Handle StepIn for constructors through PrepareStep just like for regular calls

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 503 matching lines @@
       }
       next_position_candidate_flushed_ = false;
     }
     last_position_ = static_cast<int>(rinfo->data());
   } else {
     WriteModeAndPC(pc_delta, rmode);
     if (RelocInfo::IsComment(rmode)) {
       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()));
     }
   }
   last_pc_ = rinfo->pc();
   last_mode_ = rmode;
 #ifdef DEBUG
   DCHECK(begin_pos - pos_ <= kMaxSize);
 #endif
 }
 
@@ skipping 171 matching lines @@
           if (mode_mask_ & RelocInfo::kPositionMask) {
             // Always update the position if we are interested in either
             // statement positions or non-statement positions.
             AdvanceReadPosition();
             if (SetMode(rmode)) return;
           } else {
             Advance(kIntSize);
           }
         } else if (RelocInfo::IsConstPool(rmode) ||
                    RelocInfo::IsVeneerPool(rmode) ||
-                   RelocInfo::IsDebugBreakSlotAtCall(rmode)) {
+                   RelocInfo::IsDebugBreakSlotAtCall(rmode) ||
+                   RelocInfo::IsDebugBreakSlotAtConstructCall(rmode)) {
           if (SetMode(rmode)) {
             AdvanceReadInt();
             return;
           }
           Advance(kIntSize);
         } else if (SetMode(static_cast<RelocInfo::Mode>(rmode))) {
           return;
         }
       }
     }
@@ skipping 1173 matching lines @@
 
 
 void Assembler::DataAlign(int m) {
   DCHECK(m >= 2 && base::bits::IsPowerOfTwo32(m));
   while ((pc_offset() & (m - 1)) != 0) {
     db(0);
   }
 }
 }  // namespace internal
 }  // namespace v8