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Avoid useless buffer allocations during binary COPY FROM.

Avoid useless buffer allocations during binary COPY FROM.

The raw_buf and line_buf buffers aren't used when reading binary format,
so skip allocating them. raw_buf is 64K so that seems like a worthwhile
savings. An unused line_buf only wastes 1K, but as long as we're checking
it's free to avoid allocating that too.

Bharath Rupireddy, tweaked a bit by me

Discussion: https://postgr.es/m/CALj2ACXcCKaGPY0whowqrJ4OPJvDnTssgpGCzvuFQu5z0CXb-g@mail.gmail.com

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