libobjc - more modern Objective-C runtime API (11)

[Nicola Pero]

This patch fixes a problem where class_setSuperclass() and class_getInstanceVariable() wouldn't work for classes that had not been resolved by the runtime yet.

It also include a new testcase for all the new ivar_xxx functions.

Committed to trunk.

Thanks

In libobjc/:
2010-10-16  Nicola Pero  <nicola.pero@meta-innovation.com>

        * class.c (class_getSuperclass): Call __objc_resolve_class_links
        if the class is not resolved yet.
        * ivars.c (class_getInstanceVariable): Use class_getSuperclass.
     
In gcc/testsuite/:
2010-10-16  Nicola Pero  <nicola.pero@meta-innovation.com>

        * objc.dg/gnu-api-2-ivar.m: New.

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