RFR: 8022187 Missing ResourceMark crash when assertion using FormatBufferResource fails

[Zhengyu Gu]

Please review a simple fix, that uses stack memory for formatting 
assertion message instead of resource memory.

Array is an utility class, which can be used anywhere, there is no 
guarantee to have ResourceMark setup for using resource memory.
Using stack memory here is more proper, given buffer size is only 256 
bytes.


JIRA bug: https://bugs.openjdk.java.net/browse/JDK-8022187
Webrev: http://cr.openjdk.java.net/~zgu/8022187/webrev.00/ 
<http://cr.openjdk.java.net/%7Ezgu/8022187/webrev.00/>

Test:
   - JPRT
  - Jteg test compiler/8010927/Test8010927.java on Linux x32

Thanks,

-Zhengyu