Commit [f7e134] Maximize Restore History

1.0.10.50: short-circuit LVAR type derivation when type becomes T

* Even if there are uses we have not considered yet,
%LVAR-DERIVED-TYPE can stop if the type turns into the universal
type.

Nikodemus Siivola Nikodemus Siivola 2007-10-19

changed src/compiler/ir1opt.lisp
changed version.lisp-expr
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