[PATCH] D144583: [ADT] Fix definition of `adl_begin`/`adl_end` and `Iter`/`ValueOfRange`

[Jakub Kuderski via Phabricator via llvm-commits]

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- Make `IterOfRange` and `ValueOfRange` work with types that require custom `begin`/`end` functions.
- Allow for `adl_begin`/`adl_end` to be used in constant-evaluated contexts.
- Fix `adl_begin`/`adl_end` so that they work with incomplete types. These require trailing return types, per. 7.5.2.: >  In a trailing-return-type, the class being defined is not required to be complete for purposes of class member access. Class members declared later are not visible.
- Add missing documentation comments.

This is required for future work in https://reviews.llvm.org/D144503.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D144583

Files:
  llvm/include/llvm/ADT/STLExtras.h
  llvm/unittests/ADT/STLExtrasTest.cpp

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