[clang] [Driver] Warn when using msan on Android (PR #122540)

[Carlo Cabrera via cfe-commits]

carlocab wrote:

There is already handling of unsupported sanitisers just above:

https://github.com/llvm/llvm-project/blob/77ef5a601ad3827316e412788f609e9141b51e83/clang/lib/Driver/SanitizerArgs.cpp#L523-L530

Is it not possible to incorporate the lack of support for msan on Android there?

https://github.com/llvm/llvm-project/pull/122540