Improve the exception message thrown by VarHandle of unsupported operation

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        When VarHandle::set is called on a final field, the current implementation throws UOE with no exception message.

        java.lang.UnsupportedOperationException
        at java.base/java.lang.invoke.VarForm.getMemberName(VarForm.java:92)
        at java.base/java.lang.invoke.VarHandle.getMethodHandleUncached(VarHandle.java:1986)
        at java.base/java.lang.invoke.VarHandle.getMethodHandle(VarHandle.java:1979)
        at java.base/java.lang.invoke.Invokers.checkVarHandleExactType(Invokers.java:465)
        at VarHandles.setter(VarHandles.java:84)
        at VarHandles.main(VarHandles.java:56)

        Also Remi reports this: https://mail.openjdk.java.net/pipermail/core-libs-dev/2020-December/072500.html

              Assignee:
              Mandy Chung (Inactive)
              Reporter:
              Mandy Chung (Inactive)
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                Created:
                Updated:
                Resolved: