temporary alternative IDE-compatible annotation for "value" keyword

[John Rose]

Mikael Vidstedt observed to me the other day that
he had a nice time experimenting with the "codes
like a class" aspect of value types.  He noticed one
thing that seems like a possible RFE to javac for
the experimental phase:  If the javac parser were
to accept "@__value__" as a *temporary* alias
for the "value" quasi-keyword, then various IDEs 
would be able to process the syntax more easily.

Here's a tracking issue for this:
  https://bugs.openjdk.java.net/browse/JDK-8221699

— John