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1.0.29.54.rc2: two more CTOR optimization issues
* Invalid calls of the form (MAKE-INSTANCE ''QUUX) or similar reported hard to understand errors instead of using the NO-APPLICABLE-METHOD machinery. (reported by Gabor Melis) * Runtime generation of new CTORs for the inline cache was not thread safe: grab *WORLD-LOCK* to ansure that (1) all CTORs end up in *ALL-CTORS* (2) we don't construct a CTOR with the same name twice. Also initialize the new CTOR with the initial constructor before setting its FDEFINITION: this is strictly speaking not needed given the lock, but more clearly correct. No test-case, as I was unable to actually provoke problem in real code.
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