RFR(XS): 8200360: MeetIncompatibleInterfaceArrays fails with "MeetIncompatibleInterfaceArrays0ASM.run() must be compiled at tier 0 !"

[Volker Simonis]

Hi,
can I please have a review for the following tiny test fix:

http://cr.openjdk.java.net/~simonis/webrevs/2018/8200360/
https://bugs.openjdk.java.net/browse/JDK-8200360

With the fix for JDK-8198915 I changed the test
TestMeetIncompatibleInterfaceArrays.java to more thoroughly verify if
the test method has been really compiled on the requested compilation
level. This works fine in general, but if the JTreg tests are run in
special configurations like for example "-server
-XX:-TieredCompilation", C1 compilations doesn't not work.

There are two possible solution for this problem: either relax the
check for the correct compilation level or explicitly set
"-XX:+TieredCompilation" in the "@run" action. The second variant is
possible because the options passed in the "@run" action come AFTER
the global JTreg options passed with with "-vmoptions" on the final
command line and thus can override them.

I went for the second variant in this fix because the test in question
actually wants to check the different compilation levels and it
doesn't make sense in other configurations. Finally, I now also
explicitly set "-XX:TieredStopAtLevel=4" just for the case you have
other test configurations which limit the compilations levels.

It would be great if somebody could run this trough the "hs-tier2"
test suite and any other relevant internal test suites because the
problem doesn't show up in the tier1 tests.

I also won't be available any more today, so if this is urgent and
your fine with the fix, please feel free to push it. Otherwise I'll do
it tomorrow morning (CET).

Thank you and best regards,
Volker