hg: valhalla/valhalla/jdk: Update findWither to use vwithfield (with appropriate

[paul.sandoz at oracle.com]

Changeset: d087da7feec9
Author:    psandoz
Date:      2017-06-22 11:04 -0700
URL:       http://hg.openjdk.java.net/valhalla/valhalla/jdk/rev/d087da7feec9

Update findWither to use vwithfield (with appropriate
updates to HotSpot for access control).

! src/java.base/share/classes/jdk/experimental/value/ValueType.java
! test/valhalla/mvt/PrivatePoint.java
+ test/valhalla/mvt/WithFieldTest.java