RFR: jsr166 jdk9 integration wave 14

[Martin Buchholz]

Another too-big too-scary wave for this phase of jdk9, but I still think it
should go in.  Or we can put into jdk10 first, then down-integrate into
jdk9 (when??).


http://cr.openjdk.java.net/~martin/webrevs/openjdk9/jsr166-jdk9-integration/

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concurrent-collections has spliterator bug fixes and fixes for rare but
serious performance problems in LinkedTransferQueue.
And it continues the optimization of bulk collection methods begun months
ago.

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common-pool has a fix for unwanted ClassLoader retention via an
inaccessible thread context class loader.

This differs from Chris' approach of setting the internal TCCL to null.
Instead, it unifies the handling in the default FJTF and the innocuous FJTF
by simply setting the TCCL to the system class loader.  Except that the
innocuous TCCL cannot be reset by a task.