Step next should respect do/while condition block.

src/ia32/codegen-ia32.cc

Index: src/ia32/codegen-ia32.cc
===================================================================
--- src/ia32/codegen-ia32.cc	(revision 3310)
+++ src/ia32/codegen-ia32.cc	(working copy)
@@ -2449,6 +2449,7 @@
   CodeForStatementPosition(node);
   Load(node->expression());
   Result return_value = frame_->Pop();
+  masm()->WriteRecordedPositions();
   if (function_return_is_shadowed_) {
     function_return_.Jump(&return_value);
   } else {
@@ -2712,6 +2713,8 @@
         node->continue_target()->Bind();
       }
       if (has_valid_frame()) {
+        Comment cmnt(masm_, "[ DoWhileCondition");
+        CodeForDoWhileConditionPosition(node);
         ControlDestination dest(&body, node->break_target(), false);
         LoadCondition(node->cond(), &dest, true);
       }