RFR: 8256002: Cleanup of Wrapper changes

[Mandy Chung]

On Tue, 17 Nov 2020 19:53:45 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> Cleanup of commit deprecating for removal the primitive wrapper classes.
>  - Removed the unneeded test.
>  - Restored the original code in some graal tests to avoid merge problems.
>  - Removed unnecessary use of valueOf, when implicit casts were sufficient (in RMI classes).
>  - Added a few SuppressWarnings for "removal" and "synchronization" to keep tests working.

Marked as reviewed by mchung (Reviewer).

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PR: https://git.openjdk.java.net/valhalla/pull/268