[lworld] RFR: 8252040: [lworld] Execute compiler unit tests in random order

[Tobias Hartmann]

On Wed, 19 Aug 2020 14:53:23 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> - Profiling of callee methods depends on execution order of unit tests. Execute tests in random order to increase
>   coverage.
> - At double field to test inline type
> - Verify that expected NPEs are always thrown
> - Fixed a test bug in TestLWorldProfiling.java (array element is not re-initialized and therefore NULL)
> - Refactoring and removal of old, non-applicable TODOs

Executing tests in random order triggered at least 4 new bugs that I'll fix before pushing this change.

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PR: https://git.openjdk.java.net/valhalla/pull/154