RFR(XS): 8143059: TestUnsafeUnalignedMismatchedAccesses doens't build after 8139891

[Nils Eliasson]

Hi,

I need a quick review of this very small change that blocks integration 
hs -> hs-comp.

Summary:
The unsafe package has changed in main, at the same time a new test was 
added to hs-comp with the old style import.

bug: https://bugs.openjdk.java.net/browse/JDK-8143059
webrev: http://cr.openjdk.java.net/~neliasso/8143059/webrev.01/

Regards,
Nils Eliasson