Optimize quasiquote code generation.

The surface motive here is to get better code than
forms like (append (list 'a) (list 'b) ...).

The ulterior motive is to suppress the memory
explosion when heavily nested forms like ^^^^^^^^^^^x
are expanded. This problem was uncovered by
AFL (fast).

* eval.c (optimize_qquote_form, optimize_qquote_args,
optimize_qquote): New static functions.
(expand_qquote_rec): New function.
(expand_qquote): Contents moved into expand_qquote_rec.
This function now optimizes the results of calling
expand_qquote_rec.

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