[8u40] Backport RFR: 8061969 - [TESTBUG] MallocSiteHashOverflow.java should be enabled for 32-bit platforms

[George Triantafillou]

Changes were pushed to jdk9 last 
week:http://hg.openjdk.java.net/jdk9/hs-rt/hotspot/rev/c2881c208f7a
<http://hg.openjdk.java.net/jdk9/hs-rt/hotspot/rev/c2881c208f7a>
The patch applied cleanly to 8u.

Bug: https://bugs.openjdk.java.net/browse/JDK-8061969
Webrev: http://cr.openjdk.java.net/~gtriantafill/8061969/webrev.01/

-George
<http://cr.openjdk.java.net/%7Egtriantafill/8061969/webrev>