hg: jigsaw/jake/jdk: Optimize module builder for single-modifier requires

[mandy.chung at oracle.com]

Changeset: 1689aabda779
Author:    mchung
Date:      2016-01-25 17:37 -0800
URL:       http://hg.openjdk.java.net/jigsaw/jake/jdk/rev/1689aabda779

Optimize module builder for single-modifier requires

! src/java.base/share/classes/java/lang/module/ModuleDescriptor.java
! src/java.base/share/classes/jdk/internal/module/Builder.java