libstdc++: add allocator for iterator type in maglev::Graph

Otherwise std::allocator is used and there is no conversion.

Bug: chromium:819294
Change-Id: Ic93e75a3facef96dc901dda29a6be3b4539b68e7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3492523Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Stephan Hartmann <stha09@googlemail.com>
Cr-Commit-Position: refs/heads/main@{#79302}

src/maglev/maglev-graph.h

@@ -8,14 +8,17 @@
 #include <vector>
 
 #include "src/maglev/maglev-basic-block.h"
+#include "src/zone/zone-allocator.h"
 
 namespace v8 {
 namespace internal {
 namespace maglev {
 
-using BlockConstIterator = std::vector<BasicBlock*>::const_iterator;
+using BlockConstIterator =
+    std::vector<BasicBlock*, ZoneAllocator<BasicBlock*>>::const_iterator;
 using BlockConstReverseIterator =
-    std::vector<BasicBlock*>::const_reverse_iterator;
+    std::vector<BasicBlock*,
+                ZoneAllocator<BasicBlock*>>::const_reverse_iterator;
 
 class Graph {
  public: