RFR: 8330821: Rename UnsafeCopyMemory [v2]

[Scott Gibbons]

On Mon, 22 Apr 2024 18:23:40 GMT, Scott Gibbons <sgibbons at openjdk.org> wrote:

>> Renaming UnsafeCopyMemory to UnsafeMemoryAccess since this class is now being used for Unsafe::setMemory.  This is a pure rename only.
>
> Scott Gibbons has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Address review comment

`usmm` => `umam` for consistency.

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PR Comment: https://git.openjdk.org/jdk/pull/18889#issuecomment-2070593309