[PATCH] D100764: [Support/IR] Split IR-independent bits of DataLayout into new superclass DataLayoutString

[Nico Weber via Phabricator via llvm-commits]

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…and use it to make clang's libBasic not depend on IR.

Reduces number of TUs build for 'clang-format' from 689 to 576.

Approach 2 in https://reviews.llvm.org/D17183#2653279

(not yet ready for review)


https://reviews.llvm.org/D100764

Files:
  clang/include/clang/AST/ASTContext.h
  clang/include/clang/Basic/TargetInfo.h
  clang/include/clang/CodeGen/BackendUtil.h
  clang/lib/AST/ASTContext.cpp
  clang/lib/AST/Mangle.cpp
  clang/lib/Basic/CMakeLists.txt
  clang/lib/CodeGen/BackendUtil.cpp
  clang/lib/CodeGen/ModuleBuilder.cpp
  clang/lib/CodeGen/ObjectFilePCHContainerOperations.cpp
  llvm/include/llvm/IR/DataLayout.h
  llvm/include/llvm/Support/DataLayoutString.h
  llvm/lib/IR/DataLayout.cpp
  llvm/lib/Support/CMakeLists.txt
  llvm/lib/Support/DataLayoutString.cpp
  llvm/utils/gn/secondary/clang/lib/Basic/BUILD.gn
  llvm/utils/gn/secondary/llvm/lib/Support/BUILD.gn

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