hg: amber/amber: manual merge with jep-334

[vicente.romero at oracle.com]

Changeset: d456e9c21348
Author:    vromero
Date:      2018-06-08 15:38 -0700
URL:       http://hg.openjdk.java.net/amber/amber/rev/d456e9c21348

manual merge with jep-334

! src/java.base/share/classes/java/lang/constant/ConstantMethodHandleDesc.java