[PATCH] D143501: [WIP][clang][DebugInfo] lldb: Use preferred name's type when emitting DW_AT_names

[Michael Buch via Phabricator via cfe-commits]

Michael137 created this revision.
Michael137 added reviewers: aprantl, dblaikie.
Herald added a project: All.
Michael137 requested review of this revision.
Herald added projects: clang, LLDB.
Herald added subscribers: lldb-commits, cfe-commits.

**Summary**

This patch makes debug-info generation aware of the
`[[clang::preferred_name]]` attribute. The attribute tells clang
to print the annotated class template as some typedef (e.g., in
diagnostics).

When printing a typename for emission into `DW_AT_name` this patch now
uses the preferred_name (if available). This is behind an LLDB tuning
because by default we try to avoid diverging GCC and Clang typename
format (which is why the `PrintingPolicy::UsePreferredNames` has
previously been disabled by default in `CGDebugInfo`).

**Motivation**

This will reduce noise in type summaries when showing variable
types in LLDB. E.g.,:

  (lldb) v
  (std::vector<std::basic_string<char> >) vec = size=0 {}

becomes

  (lldb) v
  (std::vector<std::string>) vec = size=0 {}

**Testing**

- Added Clang test
- Adjusted LLDB API tests


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143501

Files:
  clang/lib/CodeGen/CGDebugInfo.cpp
  clang/lib/CodeGen/CGDebugInfo.h
  clang/test/CodeGen/debug-info-preferred-names.cpp
  lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/shared_ptr/TestDataFormatterLibcxxSharedPtr.py
  lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx/unique_ptr/TestDataFormatterLibcxxUniquePtr.py

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