[debugger] negative conditional break points mute breaks and exceptions.

src/debug/debug-scopes.cc

Index: src/debug/debug-scopes.cc
diff --git a/src/debug/debug-scopes.cc b/src/debug/debug-scopes.cc
index 15a0594009307b74b90b594069b72e84525c82c6..943f6eeaaf9b85b91b520066ffb4dad7a15df5df 100644
--- a/src/debug/debug-scopes.cc
+++ b/src/debug/debug-scopes.cc
@@ -58,12 +58,8 @@ ScopeIterator::ScopeIterator(Isolate* isolate, FrameInspector* frame_inspector,
     // return, which requires a debug info to be available.
     Handle<DebugInfo> debug_info(shared_info->GetDebugInfo());
 
-    // PC points to the instruction after the current one, possibly a break
-    // location as well. So the "- 1" to exclude it from the search.
-    Address call_pc = GetFrame()->pc() - 1;
-
     // Find the break point where execution has stopped.
-    BreakLocation location = BreakLocation::FromAddress(debug_info, call_pc);
+    BreakLocation location = BreakLocation::FromFrame(debug_info, GetFrame());
 
     ignore_nested_scopes = location.IsReturn();
   }