Chris Jefferson noted that vector iterator ownership can be transferred from source to target under move construction and move assignment.  This commit makes that happen for debug mode.

llvm-svn: 140023
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: c756bb3574e437ec57a8777aee16d579afc91565
diff --git a/include/vector b/include/vector
index f469a3a..b334074 100644
--- a/include/vector
+++ b/include/vector
@@ -1106,8 +1106,8 @@
     : __base(_VSTD::move(__x.__alloc()))
 {
 #if _LIBCPP_DEBUG_LEVEL >= 2
-    __x.__invalidate_all_iterators();
     __get_db()->__insert_c(this);
+    __get_db()->swap(this, &__x);
 #endif
     this->__begin_ = __x.__begin_;
     this->__end_ = __x.__end_;
@@ -1129,7 +1129,9 @@
         this->__end_ = __x.__end_;
         this->__end_cap() = __x.__end_cap();
         __x.__begin_ = __x.__end_ = __x.__end_cap() = nullptr;
-        __x.__invalidate_all_iterators();
+#if _LIBCPP_DEBUG_LEVEL >= 2
+        __get_db()->swap(this, &__x);
+#endif
     }
     else
     {
@@ -1208,6 +1210,9 @@
     this->__end_cap() = __c.__end_cap();
     __base::__move_assign_alloc(__c);
     __c.__begin_ = __c.__end_ = __c.__end_cap() = nullptr;
+#if _LIBCPP_DEBUG_LEVEL >= 2
+    __get_db()->swap(this, &__c);
+#endif
 }
 
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES