RFR(XS): 8030070 Test java/io/File/CheckPermission.java fails due to unfinished recursion (java.lang.StackOverflowError) when JIT'ed code (-client, -server) is running

[Igor Veresov]

This is a backport of 8023542 Test java/io/File/CheckPermission.java fails due to unfinished recursion (java.lang.StackOverflowError) when JIT'ed code (-client,-server) is running  to 7u. The change is very slightly different because there is no metaspace, but, I guess, since it's not exactly the same this warrants a new review request?

The change moves the null check before trying to materialize the klass pointer.

Webrev: http://cr.openjdk.java.net/~iveresov/8030070/webrev.00/

igor
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