[PATCH] asan: optimization experiments

[Kostya Serebryany]

> > Experiment ID is a must, otherwise you will need to ask users to send you a full reproducer (something they won't be able to do), and then you will have to stare at the code trying to figure out what llvm byte code it produced and how asan pass handled it. You won't be able to just compile it, because it uses a custom build system and the bug is not reproducible without a non-trivial input.

> 


I don't understand that. If we have just one experiment at any given time -- ID is completely useless. 
If we have multiple experiments in flight it may be a bit useful, but we will still need reproducer to be able to perform complete analysis. 
The downside of Exp parameter is added complexity, code size and performance loss (probably not huge though)


http://reviews.llvm.org/D8198

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