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1.0.29.2: implement fixnump/signed-word VOP on x86 and x86-64

* No need to cons up a bignum, and just one branch required.
Eliminates a whole class of signed-word to integer coercions.

Nikodemus Siivola Nikodemus Siivola 2009-06-05

changed NEWS
changed src/compiler/x86-64/type-vops.lisp
changed src/compiler/x86/type-vops.lisp
changed version.lisp-expr
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