RFR(S): 8214773: Replace use of thread unsafe strtok

[Nils Eliasson]

Hi,

Hotspot has a few uses of the thread unsafe strtok function. Most of the 
them are probably benign since they happen during startup. The use in 
compilerDirectives however has been reported to cause errors in user 
applications that also use strtok though jni. (See bug report or mail to 
compiler list.)

In this patch I replace all uses of strtok. The call need to go through 
the os specific files since windows uses a different function (strtok_s) 
than the rest of the platforms (strtok_r).

Bug: https://bugs.openjdk.java.net/browse/JDK-8214773

Webrev: http://cr.openjdk.java.net/~neliasso/8214773/webrev.01/

Thanks to Andre Gillet at Nuance who reported the bug.

Regards,

Nils Eliasson

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