hg: jdk9/hs-gc/hotspot: 8075735: Missing include causes minimal build failure

[stefan.johansson at oracle.com]

Changeset: e7220647928c
Author:    sjohanss
Date:      2015-03-24 10:24 +0100
URL:       http://hg.openjdk.java.net/jdk9/hs-gc/hotspot/rev/e7220647928c

8075735: Missing include causes minimal build failure
Summary: Added the missing include.
Reviewed-by: jprovino, dholmes, stefank

! src/share/vm/runtime/thread.cpp