[Patch, objc++, testsuite] fix PR23612

[IainS]

the "isa" field is named differently between GNU & NeXT runtimes.
this patch introduces a new macro in "next-mapping.h" that wraps the  
difference.
tested on powerpc-apple-darwin9 and ia32 -pc-linux.

testsuite/Changelog:

2010-03-27  Iain Sandoe  <iain.sandoe@sandoe-acoustics.co.uk>

	PR objc++/23613
	* gcc/testsuite/objc-obj-c++-shared/next-mapping.h:
	(CLASSPTRFIELD): New Macro.
	* gcc/testsuite/obj-c++.dg/isa-field-1.mm: Use new CLASSPTRFIELD macro.
	Remove dg-xfail-if.

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