[inspector] never compare iterators in diferent containers

BUG=v8:6175
TBR=dgozman@chromium.org
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2828133002
Cr-Commit-Position: refs/heads/master@{#44736}

src/inspector/v8-debugger.cc

@@ -1030,7 +1030,8 @@ void V8Debugger::collectOldAsyncStacksIfNeeded() {
   m_recurringTasks.swap(recurringLeft);
   protocol::HashMap<void*, void*> parentLeft;
   for (auto it : m_parentTask) {
-    if (m_asyncTaskCreationStacks.find(it.second) == m_asyncTaskStacks.end()) {
+    if (m_asyncTaskCreationStacks.find(it.second) ==
+        m_asyncTaskCreationStacks.end()) {
       continue;
     }
     parentLeft.insert(it);