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Yet more structure redefinition hacks. Mostly rewrote UNDEFINE-STRUCTURE
to be less obscure. Made it clear the SPECIFIER-TYPE cache so that subsequent references will be noticed as unknown. In DEFINE-DEFSTRUCT-NAME, quietly blow away any existing ACCESSOR-FOR. This is necessary now that we don't always undefine a structure before redefining it, but it may also help with some of the spurious undefining that was happening. Broke off redefinition hackery into CHECK-FOR-STRUCTURE-REDEFINITION. This function checks for incompatible redefinition, and only undefines the structure if the redefinition is incompatible.
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