[cfe-dev] Disallow rtti

[Andreas Bergmeier via cfe-dev]

I am currently starting implementing a new toolchain and want to disable
rtti there.
Now saw CalculateRTTIMode in lib/Driver/ToolChain.cpp. Now I would like to
warn the user that rtti is actually no supported on that platform (for
-frtti). Currently it seems like all rtti handling in Toolchain is hard
coded.
What is the best way to indicate missing rtti on a platform?
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