> Is it possible for the buffer to only contain a single byte?

MemoryBuffer makes sure the file is null terminated, but the empty file is
still a corner case where we have a single byte buffer over read.  I should
fix it.

This is growing enough corner cases that I'm reconsidering my decision to
not put this in llvm/lib/Support/ConvertUTF8Wrappers.cc.  I didn't like the
idea of loading an entire response file (usually large) into a std::string,
but the reality is that we're building a set of strings anyway.
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