[turbofan] Initial support for the %_DateField intrinsic.

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 7c6029d9c54739d2167d12ffb2d27ce2a4e23c43..e4d1332771d8fa4306afb3f5599be74864a794ff 100644
--- a/src/compiler/access-builder.h
+++ b/src/compiler/access-builder.h
@@ -31,6 +31,9 @@ class AccessBuilder final : public AllStatic {
   // Provides access to JSArrayBuffer::backing_store() field.
   static FieldAccess ForJSArrayBufferBackingStore();
 
+  // Provides access to JSDate fields.
+  static FieldAccess ForJSDateField(JSDate::FieldIndex index);
+
   // Provides access to FixedArray::length() field.
   static FieldAccess ForFixedArrayLength();