RFR(T) : 8237953 : vmTestbase/jit/tiered/Test.java failure after JDK-8237798

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8237953/webrev.00
> 2 lines changed: 2 ins; 0 del; 0 mod; 


Hi all,

could you please review the small fix for vmTestbase/jit/tiered/Test? "TieredCompilation is disabled" case fails when the test is run w/ a JVMCI compiler b/c TieredCompilation is reenabled. to make test more robust, the patch explicitly sets CompilationMode to "high-only" in -TieredCompilation case and to "default" in +TieredCompilation. the patch depends on 8238049[1-3].

webrev: http://cr.openjdk.java.net/~iignatyev//8237953/webrev.00
JBS: https://bugs.openjdk.java.net/browse/JDK-8237953
testing: vmTestbase/jit/tiered/Test on {linux, windows, macosx}-x64 w/ and w/o JVMCI compiler

[1] https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2020-January/036850.html
[2] https://bugs.openjdk.java.net/browse/JDK-8238049
[3] http://cr.openjdk.java.net/~iignatyev/8238049/webrev.00/

Thanks,
-- Igor