Similar to how `MethodHandle#invoke(Exact)` methods are already handled, this
change adds special casing for `VarHandle.{access-mode}` methods.
The exception message is less exact, but I think that's acceptable.
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Commit messages:
- add test (and find missing method)
- make reflective calls to signature polymorphic methods in VarHandle throw UOE
Changes: https://git.openjdk.org/jdk/pull/20015/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20015&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8335638
Stats: 75 lines in 2 files changed: 71 ins; 0 del; 4 mod
Patch: https://git.openjdk.org/jdk/pull/20015.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/20015/head:pull/20015
PR: https://git.openjdk.org/jdk/pull/20015
