[PATCH] D138376: Use None consistently (NFC)

[Kazu Hirata via Phabricator via cfe-commits]

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This patch replaces NoneType() and NoneType::None with None in
preparation for migration from llvm::Optional to std::optional.

In the std::optional world, we are not guranteed to be able to
default-construct std::nullopt_t or peek what's inside it, so neither
NoneType() nor NoneType::None has a corresponding expression in the
std::optional world.

Once we consistently use None, we should even be able to replace the
contents of llvm/include/llvm/ADT/None.h with something like:

  using NoneType = std::nullopt_t;
  inline constexpr std::nullopt_t None = std::nullopt;

to ease the migration from llvm::Optional to std::optional.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D138376

Files:
  bolt/include/bolt/Core/BinaryContext.h
  bolt/include/bolt/Core/BinaryFunction.h
  bolt/include/bolt/Core/MCPlusBuilder.h
  bolt/lib/Core/BinaryContext.cpp
  bolt/lib/Core/MCPlusBuilder.cpp
  bolt/lib/Profile/BoltAddressTranslation.cpp
  bolt/lib/Profile/DataAggregator.cpp
  bolt/lib/Profile/DataReader.cpp
  bolt/lib/Rewrite/RewriteInstance.cpp
  bolt/lib/Target/X86/X86MCPlusBuilder.cpp
  bolt/lib/Utils/Utils.cpp
  clang/lib/Driver/ToolChains/HLSL.cpp
  lldb/source/Plugins/ExpressionParser/Clang/CppModuleConfiguration.cpp
  llvm/include/llvm/Analysis/InlineAdvisor.h
  llvm/include/llvm/Analysis/ObjCARCAnalysisUtils.h
  llvm/include/llvm/IR/DebugInfoMetadata.h
  llvm/lib/CodeGen/RemoveRedundantDebugValues.cpp
  llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
  llvm/unittests/DebugInfo/DWARF/DWARFExpressionCopyBytesTest.cpp
  llvm/unittests/IR/MetadataTest.cpp
  mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp

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