Request for code review - 8145037 Clean up FreeIdSet usage

[Alexander Harlap]

JDK-8145037 <https://bugs.openjdk.java.net/browse/JDK-8145037>  - Clean 
up FreeIdSet usage

Proposed change:

http://cr.openjdk.java.net/~aharlap/8145037/webrev.00/

Alex
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