Richard Wei d059735260 [Macros] Type check user-defined macro plugins (#61861) ...

Type check user-defined macros plugins with user-provided type signatures.

Also, load plugin libraries with `RTLD_LOCAL` instead of `RTLD_GLOBAL` to prevent symbol collision between plugins. `llvm::sys::DynamicLibrary` only supports `RTLD_GLOBAL` so we use the plain `dlopen` instead. This does not work on Windows and needs to be fixed.

Friend PR: apple/swift-syntax#1042

2022-11-02 18:22:31 -07:00

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