[11u] RFR: 8163511: Allocation of compile task fails with assert: "Leaking compilation tasks?"

[Roman Kennke]

This is a backport of the change mentioned in subject.

It required a change in compileTask.cpp, because the _failure_reason
handling is not in 11. The changes in tieredThresholdPolicy.cpp needed
to be done on simpleThresholdPolicy.cpp instead.

Original bug:
https://bugs.openjdk.java.net/browse/JDK-8163511

Original fix:
http://hg.openjdk.java.net/jdk/jdk/rev/cd701366fcf8

11-backport webrev:
http://cr.openjdk.java.net/~rkennke/8163511/webrev11.00/

Testing: passes tier1 w/o regressions

Can I please get a review?

Thanks,
Roman