compiler: inlined chain: simplify variadic lambdas.

The opip syntax often generates lambdas that have a trailing
parameter and use [sys:apply ...]. This is wasteful in the
second and subsequent argument positions of a chain, because we
know that only a single value is coming from the previous
function. We can pattern match these lambdas and convert
the trailing argument to a single fixed parameter.

* stdlib/compiler.tl (simplify-variadic-lambda): New function.
(inline-chain-rec): Try to simplify every function through
simplify-variadic-lambda. The leftmost function is treated in
inline-chain, so these are all second and subsequent
functions.

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