[PATCH] [GC] improve testing around gc.relocate and catch a bug

[Philip Reames]

In http://reviews.llvm.org/D6824#105192, @artagnon wrote:

> I'm yet to figure out how relocate should actually be used: I didn't quite get what happens when base index = derived index.


This means that the pointer itself is a base pointer.  This is extremely common and well supported.


http://reviews.llvm.org/D6824

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