Commit [d319b9] Maximize Restore History

0.9.3.2:

Micro-optimizations:
* MAKE-FIXNUM on PPC now takes one instruction rather than two;
* signed-num INTEGER-LENGTH VOP on PPC does not require a
temporary register;
* Added unsigned-num INTEGER-LENGTH VOP on PPC;
* Musings on processor-specific micro-optimizations added to
OPTIMIZATIONS.

Nathan Froyd Nathan Froyd 2005-07-26

changed src/compiler/ppc/arith.lisp
changed src/compiler/ppc/insts.lisp
changed src/compiler/ppc/system.lisp
changed OPTIMIZATIONS
changed version.lisp-expr
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