hg: jdk/jdk: 8214858: Improve module graph archiving

[claes.redestad at oracle.com]

Changeset: 357d2b80748d
Author:    redestad
Date:      2018-12-06 12:51 +0100
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/357d2b80748d

8214858: Improve module graph archiving
Reviewed-by: jiangli, alanb

! src/hotspot/share/memory/heapShared.cpp
! src/java.base/share/classes/jdk/internal/module/ArchivedModuleGraph.java
! src/java.base/share/classes/jdk/internal/module/ModuleBootstrap.java