Broken objc_allocateClassPair

[Luboš Doležel]

Hi,

a hack used in dynamic class registration in libobjc2/runtime.c causes 
serious trouble for apps using this API.

This is the cause of trouble:

// Initialize the metaclass
// Set the meta-metaclass pointer to the name.  The runtime will fix this
// in objc_resolve_class().
metaClass->isa = (Class)superclass->isa->isa->name;

See the attached example app, which crashes.

I could use objc_resolve_class() in between class registrations, but 
that results in +load being called, which should not be happening at 
that point.

--
Luboš Doležel

break_libobjc2.m
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