RFR: 8284579: Improve VarHandle checks for interpreter [v2]

[Claes Redestad]

On Fri, 8 Apr 2022 15:05:54 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> TestAdaptVarHandles

Thanks for reviewing, Maurizio. I ran the micros you suggested and I detect no change whatsoever at peak performance. With `-Xint` there are some small improvements in line with the results above.

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PR: https://git.openjdk.java.net/jdk/pull/8160