hg: jdk9/sandbox/hotspot: Merge from default

[erik.joelsson at oracle.com]

Changeset: 318c4d88ca9f
Author:    erikj
Date:      2016-12-27 11:54 +0100
URL:       http://hg.openjdk.java.net/jdk9/sandbox/hotspot/rev/318c4d88ca9f

Merge from default

- THIRD_PARTY_README
- src/share/vm/code/codeCacheExtensions.hpp
- src/share/vm/code/codeCacheExtensions_ext.hpp