RFR (S) 6518907: cleanup IA64 specific code in Hotspot

[Morris Meyer]

Gentlefolk,

I have taken what I hope to be the final pass at 
https://jbs.oracle.com/bugs/browse/JDK-6518907 and incorporated the 
comments of Goetz Lindenmaier of SAP. Per the HotSpot workflow I have 
submitted this change successfully to JPRT.

Vladimir Kozlov still has a concern that has been unaddressed though, 
and I would like to get resolution on this point if possible.

/One thing concern me is code change in os.cpp for Win64: //
/ /
//+   // On Windows AMD64 link() does not work as there's no back link 
on the stack. //
//+ #elif (defined(IA64) || defined(AMD64)) && defined(_WIN32) //
/ /
//Can someone familiar with Windows confirm if the statement in the 
comment and code change are correct? /

Thanks to all for the previous reviews.

         --mm

JBS - https://jbs.oracle.com/bugs/browse/JDK-6518907
WEBREV - http://cr.openjdk.java.net/~morris/6518907
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