[PATCH] D123901: [LLVM][Casting.h] Allow dyn_cast to return Optional for types that are not constructble from nullptr.

[Aman LaChapelle via Phabricator via llvm-commits]

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This will allow types that could not previously use the LLVM RTTI infrastructure to use it by simply utilizing llvm::Optional. Also adds dyn_cast_or_none for convenient optional chaining.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123901

Files:
  llvm/include/llvm/Support/Casting.h
  llvm/unittests/Support/Casting.cpp

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