RFR (XS) 8204961: JVMTI jtreg tests build warnings on 32-bit platforms

[Boris Ulasevich]

Hi all,

Please review the following patch:
   https://bugs.openjdk.java.net/browse/JDK-8204961
   http://cr.openjdk.java.net/~bulasevich/8204961/webrev.01

Recently opensourced JVMTI tests gives build warnings for ARM32 build. 
GCC complains about conversion between 4-byte pointer to 8-byte jlong 
type which is Ok in this case. I propose to hide warning using 
conversion to intptr_t.

thanks,
Boris