[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]

bzcheeseman updated this revision to Diff 423250.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D123901/new/

https://reviews.llvm.org/D123901

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

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