RFR 8179602: Fix for JDK-8165437 is broken on 32-bit Linux

[Vyom Tewari]

Hi All,

Please  review the below change.
Webrev: http://cr.openjdk.java.net/~vtewari/8179602/webrev0.0/index.html

Bugid: https://bugs.openjdk.java.net/browse/JDK-8179602

This issue is because of side effect of "JDK-8165437" where we are using 
"JVM_NanoTime" which returns a 64 bit jlong and return value was getting 
assigned to long type. On 32 bit OS long is 4 byte, which leads to 
integer overflow.

Our internal test JPRT is  still running.

Thanks,

Vyom