[LLVMdev] [Patch] Fix for PR9499 (confusing behavior of FastFoldingSetNode).

[Johannes Schaub (litb)]

I've made a patch which provides one possible fix for the unintuitive 
behavior of FastFoldingSetNode. I'm not sure whether that's a good way to 
solve this. It's based largely on the documentation found in the 
FastFoldingSet.h file, which says Profile functions should use "Add" instead 
of simply setting their parameter. 

Patch is attached on this mail and on the PR. Thanks!
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