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This prevents StringSwitch from being used with 'auto', which is important because the inferred type is StringSwitch rather than the result type. This is a problem because StringSwitch stores addresses of temporary values rather than copying or moving the value into its own storage. This is a compromise that still allows wrapping StringSwitch in other temporary structures, which (unlike StringSwitch) may be non-trivial to set up and therefore want to at least be movable. (For an example, see QueryParser.cpp in clang-tools-extra.) Changing this uncovered the bug in PassBuilder, also in this patch. Clang doesn't seem to have any occurrences of the issue. Re-commit of r276652. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276671 91177308-0d34-0410-b5e6-96231b3b80d8
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