[PATCH] D40218: [Clang] Add __builtin_launder

[Eric Fiselier via Phabricator via cfe-commits]

EricWF updated this revision to Diff 139363.
EricWF marked an inline comment as done.
EricWF added a comment.

- Launder types with subobjects of dynamic class type.
- Improve diagnostic selection using `llvm::Optional<unsigned>`.
- Add comment about LTO ABI concerns to test file.
- Merge with master.


https://reviews.llvm.org/D40218

Files:
  include/clang/Basic/Builtins.def
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/AST/ExprConstant.cpp
  lib/CodeGen/CGBuiltin.cpp
  lib/Sema/SemaChecking.cpp
  test/CodeGen/builtins.c
  test/CodeGenCXX/builtin-launder.cpp
  test/Preprocessor/feature_tests.c
  test/Sema/builtins.c
  test/SemaCXX/builtins.cpp

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