Reland "Remove the weak list of views from array buffers"

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index ff25c58f354357468a8859239b26249180ab4a5e..e60ec52d0c64fcce9a5688cee1b6947f71024def 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -6097,19 +6097,14 @@ class HObjectAccess final {
         JSArrayBuffer::kByteLengthOffset, Representation::Tagged());
   }
 
-  static HObjectAccess ForExternalArrayExternalPointer() {
+  static HObjectAccess ForJSArrayBufferFlag() {
     return HObjectAccess::ForObservableJSObjectOffset(
-        ExternalArray::kExternalPointerOffset, Representation::External());
+        JSArrayBuffer::kFlagOffset, Representation::Smi());
   }
 
-  static HObjectAccess ForJSArrayBufferViewWeakNext() {
-    return HObjectAccess::ForObservableJSObjectOffset(
-        JSArrayBufferView::kWeakNextOffset);
-  }
-
-  static HObjectAccess ForJSArrayBufferWeakFirstView() {
+  static HObjectAccess ForExternalArrayExternalPointer() {
     return HObjectAccess::ForObservableJSObjectOffset(
-        JSArrayBuffer::kWeakFirstViewOffset);
+        ExternalArray::kExternalPointerOffset, Representation::External());
   }
 
   static HObjectAccess ForJSArrayBufferViewBuffer() {