CircularBuffer.Index: remove bogus assert (#978)
CircularBuffer.Index: remove bogus assert (#978)

Motivation:

CircularBuffer.Index was asserting that its size is the same as a word.
Whilst that's true on 64-bit architectures, the assert itself is bogus
and a left-over from development.

Modifications:

Remove bogus assert.

Result:

Better 32-bit support.
apple/swift-nio,apple/swift-nio,apple/swift-nio,apple/swift-nio,apple/swift-nio