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Change how the important-result stuff is implemented. We no longer
use an IR1 attribute but allow arbitrary functions to determine if the result is used or not. This allows us to handle SORT and ADJUST-ARRAY depending on the args. Use 19c/boot-2005-11-1.lisp to bootstrap this change. compiler/knownfun.lisp: o Remove IMPORTANT-RESULT attribute. o Add new slot to function-info the hold the function to indicate if the result is not used. o Adjust %defknown with a new keyword arg :result-not-used for the new slot. o Add functions for the result-not-used arg for o SORT-RESULT-NOT-USED-P: non-NIL if the sequence might be a list. o ADJUST-ARRAY-RESULT-NOT-USED-P: non-NIL if the array is not known to be adjustable. o FUNCTION-RESULT-NOT-USED-P: non-NIL if function result must be used (for functions like nreverse). compiler/ir1opt.lisp: o Remove now unused function CHECK-IMPORTANT-RESULT o Add check in IR1-OPTIMIZE-COMBINATION to see if function result should be used. compiler/fndb.lisp: o Remove IMPORTANT-RESULT attribute and replace with :result-not-used.
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