hg: jdk9/hs-gc/hotspot: 8068582: UseSerialGC not always set up properly

[per.liden at oracle.com]

Changeset: 9d2031d829b3
Author:    pliden
Date:      2015-04-20 08:53 +0200
URL:       http://hg.openjdk.java.net/jdk9/hs-gc/hotspot/rev/9d2031d829b3

8068582: UseSerialGC not always set up properly
Reviewed-by: jmasa, brutisso, sjohanss

! src/share/vm/memory/genCollectedHeap.hpp
! src/share/vm/memory/universe.cpp
! src/share/vm/runtime/arguments.cpp
+ test/gc/arguments/TestSelectDefaultGC.java
! test/gc/startup_warnings/TestParNewSerialOld.java