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

Rafael EspĂ­ndola rafael.espindola at gmail.com
Tue Aug 26 11:22:14 PDT 2014

Hi David,

The attached patch simplifies a few interfaces that don't need to take
ownership of a buffer.

For example, both parseAssembly and parseBitcodeFile will parse the
entire buffer before returning. There is no need to take ownership.

Using a MemoryBufferRef makes it obvious in the type signature that
there is no ownership transfer.

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