[turbofan] Introduce an ExternalPointer type.

src/compiler/access-builder.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/access-builder.h"
 
 #include "src/compiler/type-cache.h"
 #include "src/contexts.h"
 #include "src/frames.h"
 #include "src/handles-inl.h"
@@ skipping 339 matching lines @@
                         MachineType::AnyTagged(),
                         kPointerWriteBarrier};
   return access;
 }
 
 // static
 FieldAccess AccessBuilder::ForFixedTypedArrayBaseExternalPointer() {
   FieldAccess access = {kTaggedBase,
                         FixedTypedArrayBase::kExternalPointerOffset,
                         MaybeHandle<Name>(),
-                        Type::OtherInternal(),
+                        Type::ExternalPointer(),
                         MachineType::Pointer(),
                         kNoWriteBarrier};
   return access;
 }
 
 // static
 FieldAccess AccessBuilder::ForDescriptorArrayEnumCache() {
   FieldAccess access = {kTaggedBase,
                         DescriptorArray::kEnumCacheOffset,
                         Handle<Name>(),
@@ skipping 134 matching lines @@
       kTaggedBase,    SlicedString::kParentOffset,  Handle<Name>(),
       Type::String(), MachineType::TaggedPointer(), kPointerWriteBarrier};
   return access;
 }
 
 // static
 FieldAccess AccessBuilder::ForExternalStringResourceData() {
   FieldAccess access = {kTaggedBase,
                         ExternalString::kResourceDataOffset,
                         Handle<Name>(),
-                        Type::OtherInternal(),
+                        Type::ExternalPointer(),
                         MachineType::Pointer(),
                         kNoWriteBarrier};
   return access;
 }
 
 // static
 ElementAccess AccessBuilder::ForExternalOneByteStringCharacter() {
   ElementAccess access = {kUntaggedBase, 0, TypeCache::Get().kUint8,
                           MachineType::Uint8(), kNoWriteBarrier};
   return access;
@@ skipping 248 matching lines @@
   }
   UNREACHABLE();
   ElementAccess access = {kUntaggedBase, 0, Type::None(), MachineType::None(),
                           kNoWriteBarrier};
   return access;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8