[PATCH] [Sanitizers] Provide better diagnostic for sanitizers unsupported for target triple.

[Filipe Cabecinhas]

I would really like to keep our current tests, but unfortunately, our ToolChain isn't upstreamed, yet. :-(
When we do it, I'll implement the remaining parts and add the checks back.

Having the toolchains have the last word on which sanitizers are supported seems like a better way to do it.
LGTM


http://reviews.llvm.org/D10467

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