[PATCH] D24862: Workaround ASTMatcher crashes. Added some more test cases.

[Eric Liu via cfe-commits]

ioeric created this revision.
ioeric added a reviewer: hokein.
ioeric added a subscriber: cfe-commits.

- UsingDecl matcher crashed when `UsingShadowDecl` has no parent map. Workaround by moving parent check into `UsingDecl`.
- FunctionDecl matcher crashed when there is a lambda defined in parameter list (also due to no parent map).
  Workaround by putting `unless(cxxMethodDecl())` before parent check.

https://reviews.llvm.org/D24862

Files:
  change-namespace/ChangeNamespace.cpp
  change-namespace/tool/ClangChangeNamespace.cpp
  unittests/change-namespace/ChangeNamespaceTests.cpp

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