compiler: fbind/lbind: elide unnecessary frames.

* stdlib/compiler.tl (comp-fbind): When after removing unused
functions we are left with an empty list (or the list of
functions was empty to begin with), let's only emit the body
fragment without any frame wrapping. We can't just return
bfrag because that was compiled in the environment which
matches the frame. Instead of the expense of compiling the
code again, we rely on eliminate-frame to move all v registers
up one level.

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