[llvm-commits] [patch] add gcroot attribute, test

[Eric Christopher]

Here are a pair of patches to add an attribute to automatically gcroot  
things based on type. It currently works for pointers to structures  
only because a) that's all I need, and b) I think that's all that  
makes sense really. I could remove the restriction if someone can come  
up with a good use case for other types. Note that we're also zeroing  
out automatic variables as well so if we do a collection before  
they're initialized we don't end up following garbage.

Tested on x86-darwin.

-eric

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