[PATCH] D46940: [ASTImporter] make sure that ACtx::getParents still works

[Rafael Stahl via Phabricator via cfe-commits]

r.stahl created this revision.
r.stahl added reviewers: a.sidorin, klimek.
Herald added subscribers: cfe-commits, martong.

If an AST node is imported after a call to getParents in the ToCtx, it was no longer possible to retrieve its parents since the old results were cached.

Valid types for getParents:

- Decl, Stmt, NestedNameSpecifier: handled explicitly
- Type: not supported by ast importer
- TypeLoc: not imported
- NestedNameSpecifierLoc: calls import for NNS


Repository:
  rC Clang

https://reviews.llvm.org/D46940

Files:
  include/clang/AST/ASTContext.h
  lib/AST/ASTImporter.cpp
  unittests/AST/ASTImporterTest.cpp

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