deps: improve ArrayBuffer performance in v8

This a backport of the following commits from the v8's upstream:

* 1a8c38c50513f9af07ada479629a653e1cf36ff3
* 206f12abee3f1e7eda8fc6521d48f3c319460ee1
* 9e3676da9ab1aaf7de3e8582cb3fdefcc3dbaf33

Original commit message:

    heap: make array buffer maps disjoint

    Remove intersection from the `std::map`s representing current live
    ArrayBuffers. While being simpler to understand, it poses
    significant performance issue for the active ArrayBuffer users (like
    node.js).

    Store buffers separately, and process them together during
    mark-sweep phase.

    The results of benchmarks are:

    $ ./node-slow bench && ./node-fast bench
    4997.4 ns/op
    4685.7 ns/op

    NOTE: `fast` - was a patched node.js, `slow` - unpatched node.js
    with vanilla v8.

PR-URL: https://github.com/nodejs/node/pull/2732
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Brian White <mscdex@mscdex.net>
Reviewed-By: Roman Reiss <me@silverwind.io>

1 files changed, 0 insertions, 15 deletions

diff --git a/deps/v8/src/heap/heap.h b/deps/v8/src/heap/heap.h
index 4c9e3ad144..0f0cfc15fc 100644
--- a/deps/v8/src/heap/heap.h
+++ b/deps/v8/src/heap/heap.h
@@ -2147,21 +2147,6 @@ class Heap {
   // Called on heap tear-down. Frees all remaining ArrayBuffer backing stores.
   void TearDownArrayBuffers();
 
-  // These correspond to the non-Helper versions.
-  void RegisterNewArrayBufferHelper(std::map<void*, size_t>& live_buffers,
-                                    void* data, size_t length);
-  void UnregisterArrayBufferHelper(
-      std::map<void*, size_t>& live_buffers,
-      std::map<void*, size_t>& not_yet_discovered_buffers, void* data);
-  void RegisterLiveArrayBufferHelper(
-      std::map<void*, size_t>& not_yet_discovered_buffers, void* data);
-  size_t FreeDeadArrayBuffersHelper(
-      Isolate* isolate, std::map<void*, size_t>& live_buffers,
-      std::map<void*, size_t>& not_yet_discovered_buffers);
-  void TearDownArrayBuffersHelper(
-      Isolate* isolate, std::map<void*, size_t>& live_buffers,
-      std::map<void*, size_t>& not_yet_discovered_buffers);
-
   // Record statistics before and after garbage collection.
   void ReportStatisticsBeforeGC();
   void ReportStatisticsAfterGC();