RFR: JDK-8166748 Clean out Windows IA64 support

[George Triantafillou]

Please review this fix to clean out Windows IA64 support:
JBS: https://bugs.openjdk.java.net/browse/JDK-8166748
open webrev (jdk): 
http://cr.openjdk.java.net/~gtriantafill/8166748-webrev/jdk/webrev/index.html 
<http://cr.openjdk.java.net/%7Egtriantafill/8166748-webrev/jdk/webrev/index.html>
open webrev (hotspot): 
http://cr.openjdk.java.net/~gtriantafill/8166748-webrev/hotspot/webrev/index.html 
<http://cr.openjdk.java.net/%7Egtriantafill/8166748-webrev/hotspot/webrev/index.html>

Please note that this issue is specifically for removing Windows IA64 
support.

Built and tested on Windows x64.  Thanks.

-George