[turbofan] Introduce initial support for TypedArrays.

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 d4cdd4d24e51ba6fa6b3747b0b482aa615a9735a..38b2803cfb2c7e14e308777ebe39278fe58e28c4 100644
--- a/src/compiler/access-builder.h
+++ b/src/compiler/access-builder.h
@@ -106,6 +106,12 @@ class AccessBuilder final : public AllStatic {
   // Provides access to FixedArray::length() field.
   static FieldAccess ForFixedArrayLength();
 
+  // Provides access to FixedTypedArrayBase::base_pointer() field.
+  static FieldAccess ForFixedTypedArrayBaseBasePointer();
+
+  // Provides access to FixedTypedArrayBase::external_pointer() field.
+  static FieldAccess ForFixedTypedArrayBaseExternalPointer();
+
   // Provides access to DescriptorArray::enum_cache() field.
   static FieldAccess ForDescriptorArrayEnumCache();