Don't infinite-loop on ill-formed DEFSYSTEM :perform option
Before this commit, ill-formed DEFSYSTEM options of the form
:perform ((op ...)) instead of :perform (op ...)
caused %DEFINE-COMPONENT-INLINE-METHODS to infinite-loop.
Before this commit, ill-formed DEFSYSTEM options of the form
:perform ((op ...)) instead of :perform (op ...)
caused %DEFINE-COMPONENT-INLINE-METHODS to infinite-loop.