Commit [203e2a] Maximize Restore History

New keyword argument for SB-C:DEFKNOWN: :overwrite-fndb-silently

While not useful in the compiler itself, some libraries (not only
contribs) define their own VOPs, transforms, etc., and the error
when clobbering pre-existing defknowns made these libraries hard
to reload.

Use with :allow-other-keys for backward compatibility.

Paul Khuong Paul Khuong 2013-03-04

changed contrib/sb-rotate-byte/compiler.lisp
changed contrib/sb-simple-streams/fndb.lisp
changed src/compiler/knownfun.lisp
changed NEWS
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