RFR (XS): JDK-805896 metaspace/shrink_grow/CompressedClassSpaceSize fails with OOM: Compressed class space

[Joseph Provino]

Can I get reviews for the following fix?  The problem is that an attempt 
is made
to allocate a medium chunk for class metaspace but there are no medium 
chunks available.
However there are many small chunks available.

If the allocation request size fits in a small chunk, the fix is to try 
allocating a small
chunk after failing to allocate a medium chunk.

Changes are in one file.

http://cr.openjdk.java.net/~jprovino/8058967/webrev.00

https://bugs.openjdk.java.net/browse/JDK-8058967

Passed JPRT

Aurora ad-hoc test of vm.parallel_class_loading:

http://aurora.ru.oracle.com/functional/faces/RunDetails.xhtml?names=882047.VMSQE.adhoc.JPRT-1

thanks.

joe
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