[turbofan] Assign appropriate types to some Date builtins.

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 caaf8f8c0675bbc6a1e6ec3ce81c747c8a6ac5de..94ed0f7edd3e59635e79013cf136963807056d71 100644
--- a/src/compiler/access-builder.h
+++ b/src/compiler/access-builder.h
@@ -89,6 +89,9 @@ class AccessBuilder final : public AllStatic {
   // Provides access to JSTypedArray::length() field.
   static FieldAccess ForJSTypedArrayLength();
 
+  // Provides access to JSDate::value() field.
+  static FieldAccess ForJSDateValue();
+
   // Provides access to JSDate fields.
   static FieldAccess ForJSDateField(JSDate::FieldIndex index);