Commit [040344] Maximize Restore History

Fix inline fixnum LDB on PowerPC for certain bytespecs

Previously, the inline fixnum version of (ldb (byte 8 24) -1) would
return #x3f instead of #ff.

David Lichteblau David Lichteblau 2012-06-07

changed src/compiler/ppc/arith.lisp
changed tests/arith.impure.lisp
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