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

[Eric Christopher]

>
> GCC carefully packs these bitfields so that there are exactly 32 of  
> them.  With this addition, you'll push over and require an extra  
> word for every tree.  Would it be possible to record the gcroot flag  
> in the attributes list somehow?  This tradeoff seems worthwhile,  
> because almost no structs will be marked as GCable.

Sure. Here's the new patch. I removed any dependence on RECORD_TYPE,  
but make sure we have a pointer at least to gcroot from.

-eric

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