compiler: code clean-up in peephole optimizer.

* stdlib/optimize.tl (basic-blocks peephole-block): When we match a
branching instruction, including jend, we know that's the end of the
basic block. So there is no need to splice the (rest insns) into
the output; let's get rid of that. On the other hand, there is also no
need to have a specific pattern match for the end of the list such
as ((jmp @label)). This costs extra cycles to validate. Let's
consistently match these basic-block terminating instructions using
prefix patterns like ((jmp @label) . @nil)).

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