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

[vicente.romero at oracle.com]

Changeset: 03fc38443e5e
Author:    vromero
Date:      2018-12-07 11:34 -0500
URL:       http://hg.openjdk.java.net/amber/amber/rev/03fc38443e5e

manual merge with jep-334

! src/java.base/share/classes/java/lang/String.java
! src/java.base/share/classes/java/lang/constant/DynamicCallSiteDesc.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/code/Symtab.java