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Upgrade to LLVM 16, again Relative to the previous attempt in https://github.com/rust-lang/rust/pull/107224: * Update to GCC 8.5 on dist-x86_64-linux, to avoid std::optional ABI-incompatibility between libstdc++ 7 and 8. * Cherry-pick96df79af02. * Cherry-pick6fc670e5e3. r? `@cuviper`