llvm-project

90670b5c - Support: Add proxies for raw_ostream and raw_pwrite_stream (#113362)

Support: Add proxies for raw_ostream and raw_pwrite_stream (#113362) Add proxies classes for `raw_ostream` and `raw_pwrite_stream` called `raw_ostream_proxy` and `raw_pwrite_stream_proxy`. Add adaptor classes, `raw_ostream_proxy_adaptor<>` and `raw_pwrite_stream_proxy_adaptor<>`, to allow subclasses to use a different parent class than `raw_ostream` or `raw_pwrite_stream`. The adaptors are used by a future patch to help a subclass of `llvm::vfs::OutputFile`, an abstract subclass of `raw_pwrite_stream`, to proxy a `raw_fd_ostream`. Patched by dexonsmith.