compiler: another late-peephole pattern.

* share/txr/stdlib/optimize.tl (late-peephole): Add a
6-instruction pattern which is seen in pattern-matching code
in optimize.tlo and compiler.tlo. This can be tidied up a
little bit, reducing the instructions to 5, eliminating
redundant comparisons and threading a jump. At this point we
are probably working too hard for too little gain.  More
effort in other areas like common subexpression elimination
could produce bigger wins.

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