RFR(xxs): 8226227: Missing include of thread.inline.hpp

[Robbin Ehn]

Hi all, please consider this small change.

I found two missing include of thread.inline.hpp.

Issue:
https://bugs.openjdk.java.net/browse/JDK-8226227
Code:
http://cr.openjdk.java.net/~rehn/8226227/webrev/

Passes t1-3

Thanks, Robbin