[9] RFR(XS): 8042428: CompileQueue::free_all() code is incorrect

[Albert]

Hi all,

could I get reviews for this small patch?

Bug:
https://bugs.openjdk.java.net/browse/JDK-8042428

Problem:
The loop in CompileQueue::free_all() is incorrect because 
CompileTask::_next field is overwritten by CompileTask::free().

Solution:
Free task after getting next pointer of freelist.

Webrev:
http://cr.openjdk.java.net/~anoll/8042428/webrev.00/


Many thanks in advance,
Albert
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