hg: jdk/sandbox: 8187588: Error generating using JDK 9 javadoc against a JDK 8 source repository

[chris.hegarty at oracle.com]

Changeset: 2053c5489a9e
Author:    ksrini
Date:      2017-11-20 16:50 -0800
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/2053c5489a9e

8187588: Error generating using JDK 9 javadoc against a JDK 8 source repository
Reviewed-by: jjg

! src/jdk.javadoc/share/classes/jdk/javadoc/internal/tool/ToolOption.java
+ test/langtools/jdk/javadoc/tool/testSourceOption/TestSourceOption.java