RFR (S): 8038930: G1CodeRootSet::test fails with assert(_num_chunks_handed_out == 0) failed: No elements must have been handed out yet

[Thomas Schatzl]

Hi all,

  can I have reviews for the following fix for a test case?

This test case does some basic code validation on recently introduced
code root memory management for G1 introduced recently (JDK-8035406).

It assumed that before running the test, no code root memory has been
handed out.

The problem is now, when running with -Xcomp, before the internal VM
tests (and this test) are run, it is likely that compiled code already
did some code root allocations.

So the test needs to be aware of that, and not assume that the number of
code root memory handed out is not zero.

This change fixes that assumption.

CR:
https://bugs.openjdk.java.net/browse/JDK-8038930

Webrev:
http://cr.openjdk.java.net/~tschatzl/8038930/webrev/

Testing:
jprt, manual invocation of test case with -Xcomp

Thanks,
  Thomas