hg: amber/amber: Minor spec and API touch-ups

[brian.goetz at oracle.com]

Changeset: f44721e1c901
Author:    briangoetz
Date:      2018-05-23 13:56 -0400
URL:       http://hg.openjdk.java.net/amber/amber/rev/f44721e1c901

Minor spec and API touch-ups

! src/java.base/share/classes/java/lang/invoke/constant/AsTypeMethodHandleDesc.java
! src/java.base/share/classes/java/lang/invoke/constant/ClassDesc.java
! src/java.base/share/classes/java/lang/invoke/constant/Constable.java
! src/java.base/share/classes/java/lang/invoke/constant/ConstantDesc.java
! src/java.base/share/classes/java/lang/invoke/constant/ConstantDescs.java
! src/java.base/share/classes/java/lang/invoke/constant/DynamicCallSiteDesc.java
! src/java.base/share/classes/java/lang/invoke/constant/DynamicConstantDesc.java
! src/java.base/share/classes/java/lang/invoke/constant/PrimitiveClassDesc.java