RFR(S) 8004872: Early loading of HashMap under -XX:+AggressiveOpts can be removed

[Calvin Cheung]

Please review a small fix:
http://cr.openjdk.java.net/~ccheung/8004872/webrev/

Bug:
https://jbs.oracle.com/bugs/browse/JDK-8004872
(public bug not available)

Summary:
The HashMap class under altclasses/java/util in the jdk repo.
was removed via another bug fix. Therefore, the initialization code for
that class on the jvm side can also be removed.

Testing:
JPRT
Aurora adhoc vm.quick on Mac OSX
     (other platforms in progress)

thanks,
Calvin