hg: valhalla/valhalla: Summary: Add -XDallowEmptyValues to JTReg test .../valuetypes/Empty.java so it will compile

[harold.seigel at oracle.com]

Changeset: afd996f10a3b
Author:    hseigel
Date:      2018-07-05 14:17 -0400
URL:       http://hg.openjdk.java.net/valhalla/valhalla/rev/afd996f10a3b

Summary: Add -XDallowEmptyValues to JTReg test .../valuetypes/Empty.java so it will compile
Reviewed-by: forax

! test/hotspot/jtreg/runtime/valhalla/valuetypes/Empty.java