[whatwg/streams] Extract length and offset from TypedArray view before transferring its buffer (#868)

In #753 I introduced a change that transfers the view's buffer before querying the view's length and offset. Querying those after the buffer transfer obviously won't work, so this PR extracts the values before the transfer.

No test changes because the tests are adequate as they are.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/868

-- Commit Summary --

  * Extract length and offset from TypedArray view before transferring its buffer

-- File Changes --

    M index.bs (6)

-- Patch Links --

https://github.com/whatwg/streams/pull/868.patch
https://github.com/whatwg/streams/pull/868.diff

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