Revert TracedReference deref API removal

This API was removed in V8 12.7, but we don't know how to safely replace our use of it yet.

WORKSPACE

@@ -487,6 +487,7 @@ http_archive(
         "//:patches/v8/0014-Modify-where-to-look-for-fp16-dependency.-This-depen.patch",
         "//:patches/v8/0015-Expose-v8-Symbol-GetDispose.patch",
         "//:patches/v8/0016-Rename-V8_COMPRESS_POINTERS_IN_ISOLATE_CAGE-V8_COMPR.patch",
+        "//:patches/v8/0017-Revert-TracedReference-deref-API-removal.patch",
     ],
     integrity = "sha256-A5gcTFlyFPytY8/xVz9okQzqXB3f6Zo3vQNOMhEyKyY=",
     strip_prefix = "v8-12.7.224.1",

patches/v8/0017-Revert-TracedReference-deref-API-removal.patch

@@ -0,0 +1,29 @@
+From e35a1f2acb6b61c1a74788c7e772376e307f9aba Mon Sep 17 00:00:00 2001
+From: Harris Hancock <harris@cloudflare.com>
+Date: Fri, 28 Jun 2024 14:19:25 +0100
+Subject: Revert TracedReference deref API removal
+
+This previously-deprecated API was removed in 7cd2b0c434bd5ea7bd253a97958c7348557fd72e, but we don't know how to safely replace our usage of it yet.
+
+diff --git a/include/v8-traced-handle.h b/include/v8-traced-handle.h
+index 04752c4f2aeed025364326fb0a0d85c03ba3347c..f1a41b1d8cd756358b536ee90ca9bd8c6b601e69 100644
+--- a/include/v8-traced-handle.h
++++ b/include/v8-traced-handle.h
+@@ -135,6 +135,17 @@ class BasicTracedReference : public TracedReferenceBase {
+         const_cast<BasicTracedReference<T>&>(*this));
+   }
+
++  V8_DEPRECATED("Use Get to convert to Local instead")
++  V8_INLINE T* operator->() const {
++#ifdef V8_ENABLE_CHECKS
++    CheckValue();
++#endif  // V8_ENABLE_CHECKS
++    return this->template value<T>();
++  }
++
++  V8_DEPRECATED("Use Get to convert to Local instead")
++  V8_INLINE T* operator*() const { return this->operator->(); }
++
+  private:
+   /**
+    * An empty BasicTracedReference without storage cell.