Updates to tests reflecting array-move restrictions.

Note that the change to the error message in
borrowck-use-in-index-lvalue.rs, where we report that `*w` is
uninitialized rather than `w`, was unintended fallout from the
implementation strategy used here.

The change appears harmless to me, but I welcome advice on how to
bring back the old message, which was slightly cleaner (i.e. less
unintelligible).

----

drive-by: revise compile-fail/borrowck-vec-pattern-move-tail to make
it really clear that there is a conflict that must be signaled.

(A hypothetical future version of Rust might be able to accept the
prior version of the code, since the previously updated index was not
actually aliased.)

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