Remove ExternalArray, derived types, and element kinds

src/compiler/access-builder.h

Index: src/compiler/access-builder.h
diff --git a/src/compiler/access-builder.h b/src/compiler/access-builder.h
index 240ffdcb5dac59d11998b0bf7cf0c0b386f61197..95be3e0dd84b7ad9c9ac97b566f402359b1899be 100644
--- a/src/compiler/access-builder.h
+++ b/src/compiler/access-builder.h
@@ -43,9 +43,6 @@ class AccessBuilder final : public AllStatic {
   // Provides access to FixedArray::length() field.
   static FieldAccess ForFixedArrayLength();
 
-  // Provides access to ExternalArray::external_pointer() field.
-  static FieldAccess ForExternalArrayPointer();
-
   // Provides access to DescriptorArray::enum_cache() field.
   static FieldAccess ForDescriptorArrayEnumCache();