[cfe-commits] [PATCH] PR13824 warn if reinterpret_cast used for up/downcast

[Alexander Zinenko]

Hello!

The attached patch addresses http://llvm.org/bugs/show_bug.cgi?id=13824. It
emits a warning if reinterpret_cast is actually used to perform an upcast
or a downcast which might lead to segfault in some cases.

Review please!

Suggestions for warning text structure and wording are welcome!
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