Detected by ASAN:
```
Direct leak of 243151 byte(s) in 747 object(s) allocated from:
    #0 0x4e1710 in __interceptor_malloc (/home/kfunk/devel/install/kf5-stable/bin/kdevelop+0x4e1710)
    #1 0x7effd10b3221 in clang::cxstring::createDup(llvm::StringRef) /home/kfunk/devel/src/llvm/tools/clang/tools/libclang/CXString.cpp:99:40
    #2 0x7effd10b3221 in clang::cxstring::createRef(llvm::StringRef) /home/kfunk/devel/src/llvm/tools/clang/tools/libclang/CXString.cpp:89
    #3 0x7effd1292ae3 in void (anonymous namespace)::Visitor::setDeclData<(CXCursorKind)21>(CXCursor, KDevelop::ClassMemberDeclaration*) const /home/kfunk/devel/src/kf5/kdevelop-stable/plugins/clang/duchain/builder.cpp:1024:5
    #4 0x7effd1291bd0 in void (anonymous namespace)::Visitor::setDeclData<(CXCursorKind)21>(CXCursor, KDevelop::ClassFunctionDeclaration*) const /home/kfunk/devel/src/kf5/kdevelop-stable/plugins/clang/duchain/builder.cpp:1113:5
    ...
```

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