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Currently `TypePrinter` lumps anonymous classes and unnamed classes in one 
group `"anonymous"` this is not correct and can be confusing in some contexts. 
e.g.

LLDB SBType <https://lldb.llvm.org/python_reference/lldb.SBType-class.html> 
provides an `IsAnonymousType()` function but when displaying the type we see 
conflicting information, given:

    struct A { 
     struct { int x; }; // A
     struct { int y; } B;
  };
  
  int main() {
     A a1; 
    //...
  }

we get the following in LLDB:

  (lldb) script var = lldb.frame.FindVariable("a1")
  (lldb) script print(var.GetChildAtIndex(0).GetType().IsAnonymousType())
  True
  (lldb) script print(var.GetChildAtIndex(1).GetType().IsAnonymousType())
  False
  (lldb) script print(var.GetChildAtIndex(0).GetType().GetName())
  A::(anonymous struct)
  (lldb) script print(var.GetChildAtIndex(1).GetType().GetName())
  A::(anonymous struct)


https://reviews.llvm.org/D96807

Files:
  clang/lib/AST/TypePrinter.cpp
  clang/test/AST/ast-dump-decl-json.c
  clang/test/AST/ast-dump-openmp-cancel.c
  clang/test/AST/ast-dump-openmp-cancellation-point.c
  clang/test/AST/ast-dump-openmp-distribute-parallel-for-simd.c
  clang/test/AST/ast-dump-openmp-distribute-parallel-for.c
  clang/test/AST/ast-dump-openmp-distribute-simd.c
  clang/test/AST/ast-dump-openmp-distribute.c
  clang/test/AST/ast-dump-openmp-for-simd.c
  clang/test/AST/ast-dump-openmp-for.c
  clang/test/AST/ast-dump-openmp-ordered.c
  clang/test/AST/ast-dump-openmp-parallel-for-simd.c
  clang/test/AST/ast-dump-openmp-parallel-for.c
  clang/test/AST/ast-dump-openmp-parallel-sections.c
  clang/test/AST/ast-dump-openmp-parallel.c
  clang/test/AST/ast-dump-openmp-section.c
  clang/test/AST/ast-dump-openmp-sections.c
  clang/test/AST/ast-dump-openmp-simd.c
  clang/test/AST/ast-dump-openmp-single.c
  clang/test/AST/ast-dump-openmp-target-data.c
  clang/test/AST/ast-dump-openmp-target-enter-data.c
  clang/test/AST/ast-dump-openmp-target-exit-data.c
  clang/test/AST/ast-dump-openmp-target-parallel-for-simd.c
  clang/test/AST/ast-dump-openmp-target-parallel-for.c
  clang/test/AST/ast-dump-openmp-target-parallel.c
  clang/test/AST/ast-dump-openmp-target-simd.c
  clang/test/AST/ast-dump-openmp-target-teams-distribute-parallel-for-simd.c
  clang/test/AST/ast-dump-openmp-target-teams-distribute-parallel-for.c
  clang/test/AST/ast-dump-openmp-target-teams-distribute-simd.c
  clang/test/AST/ast-dump-openmp-target-teams-distribute.c
  clang/test/AST/ast-dump-openmp-target-teams.c
  clang/test/AST/ast-dump-openmp-target-update.c
  clang/test/AST/ast-dump-openmp-target.c
  clang/test/AST/ast-dump-openmp-task.c
  clang/test/AST/ast-dump-openmp-taskgroup.c
  clang/test/AST/ast-dump-openmp-taskloop-simd.c
  clang/test/AST/ast-dump-openmp-taskloop.c
  clang/test/AST/ast-dump-openmp-teams-distribute-parallel-for-simd.c
  clang/test/AST/ast-dump-openmp-teams-distribute-parallel-for.c
  clang/test/AST/ast-dump-openmp-teams-distribute-simd.c
  clang/test/AST/ast-dump-openmp-teams-distribute.c
  clang/test/AST/ast-dump-openmp-teams.c
  clang/test/AST/ast-dump-records-json.cpp
  clang/test/AST/ast-dump-records.c
  clang/test/AST/ast-dump-records.cpp
  clang/test/AST/ast-dump-stmt-json.m
  clang/test/ASTMerge/struct/test.c
  clang/test/Analysis/cfg.cpp
  clang/test/Analysis/padding_c.c
  clang/test/Index/print-type.c
  clang/test/Layout/ms-x86-alias-avoidance-padding.cpp
  clang/test/PCH/stmt-openmp_structured_block-bit.cpp
  clang/test/Sema/assign.c
  clang/test/SemaCXX/condition.cpp
  
lldb/test/Shell/SymbolFile/DWARF/clang-ast-from-dwarf-unamed-and-anon-structs.cpp
  lldb/test/Shell/SymbolFile/DWARF/debug-types-missing-signature.test

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