RFR (S) 8201224: Make string buffer size dynamic

[JC Beyler]

Hi all,

Small change to the locationToString method to make the string dynamically
generated.

I added a bit of paranoia to handle the case where things might be changed
so that an error would propagate to the test.

Igor asked me to also at least fix the NSK_VERIFY tests in the file.

Let me know what you think:

Webrev: http://cr.openjdk.java.net/~jcbeyler/8201224/webrev.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8201224

Thanks,
Jc

Ps: A lot of these tests seem to be in GCC style (where spaces are all over
the place, 4 space indent, etc.), should we do a one-pass per folder to
make it into more standard hotspot style?
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