Code review request: 8007950: Undo hs_file permission change

[Zhengyu Gu]

The original change to hs_file permission was pushed prematurely, as it 
might have impact to hotspot build and test infrastructures. This change 
is to simply reverse the early one, and we will address the original CR 
once infrastructures are ready.

CR: https://jbs.oracle.com/bugs/browse/JDK-8007950
Webrev: http://cr.openjdk.java.net/~zgu/8007950/webrev.00/

Thanks,

-Zhengyu