[PATCH] D128131: [ADT] Add has_value, value, value_or to llvm::Optional

[Kazu Hirata via Phabricator via llvm-commits]

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This patch adds has_value, value, value_or to llvm::Optional so that
llvm::Optional looks more like std::optional.

I will keep the existing functions while migrating their callers and
then remove them later.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128131

Files:
  llvm/include/llvm/ADT/Optional.h
  llvm/unittests/ADT/OptionalTest.cpp

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