[patch] Pass a MemoryBufferRef when we can avoid taking ownership

[Rafael Espíndola]

> Actually I did mean && - it's not uncommon for APIs to take by movement then
> fail to move-from in their failure path. Granted in the C++ standard library
> that failure is demonstrated by throwing an exception, whereas this has a
> return result.

OK, so this patch (on top of all previous which were already
committed) changes the & to &&. I personally find a
"foo(std::move(bar))" that doesn't always move bar to be a bit
confusing, but if that is common, I am OK with it.

Cheers,
Rafael
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