RFR JDK-8179861: Missing copyrights in some hotspot files

[George Triantafillou]

Please review this small fix to include missing copyrights in some 
hotspot files:

JBS: https://bugs.openjdk.java.net/browse/JDK-8179861
webrev: 
http://cr.openjdk.java.net/~gtriantafill/8179861-webrev/webrev/index.html 
<http://cr.openjdk.java.net/%7Egtriantafill/8179861-webrev/webrev/index.html>

Built and tested on Linux x64.

Thanks.

-George