chore: bump node to v12.18.0 (master) (#23789)

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

patches/node/override_existing_v8_reallocate.patch

@@ -6,18 +6,18 @@ Subject: Override existing V8 Reallocate
 Refs https://chromium-review.googlesource.com/c/v8/v8/+/2007274.
 Reallocate has been implemented by V8 itself, so this function must now
 be overridden. This patch can be removed once the relevant version of V8
-makes its way into Node.js
+makes its way into Node.js.
 
 diff --git a/src/node_internals.h b/src/node_internals.h
-index 0279a4a8274f408049aae5464a7f4559ebe48110..e5d5a6497de3386c7aa70efc1f202f79d9f7567f 100644
+index b627ad3ef42835407a83b721a2f78d4128e48327..efea9db2da008be6a1a470cece9d7a04a628c1a8 100644
 --- a/src/node_internals.h
 +++ b/src/node_internals.h
 @@ -115,7 +115,7 @@ class NodeArrayBufferAllocator : public ArrayBufferAllocator {
-   void* AllocateUninitialized(size_t size) override
-     { return node::UncheckedMalloc(size); }
-   void Free(void* data, size_t) override { free(data); }
--  virtual void* Reallocate(void* data, size_t old_size, size_t size) {
-+  virtual void* Reallocate(void* data, size_t old_size, size_t size) override {
-     return static_cast<void*>(
-         UncheckedRealloc<char>(static_cast<char*>(data), size));
+   void* Allocate(size_t size) override;  // Defined in src/node.cc
+   void* AllocateUninitialized(size_t size) override;
+   void Free(void* data, size_t size) override;
+-  virtual void* Reallocate(void* data, size_t old_size, size_t size);
++  virtual void* Reallocate(void* data, size_t old_size, size_t size) override;
+   virtual void RegisterPointer(void* data, size_t size) {
+     total_mem_usage_.fetch_add(size, std::memory_order_relaxed);
    }