Successful merges:

• Document JSON message output. #64925 (Document JSON message output.)
• Disable Go and OCaml bindings when building LLVM #65201 (Disable Go and OCaml bindings when building LLVM)
• Add long error explanation for E0575 #65334 (Add long error explanation for E0575)
• Add more coherence tests #65417 (Add more coherence tests)
• Avoid unnecessary TokenTree to TokenStream conversions #65455 (Avoid unnecessary TokenTree to TokenStream conversions)
• Use a sharded dep node to dep node index map #65472 (Use a sharded dep node to dep node index map)
• Speed up LexicalResolve::expansion() #65480 (Speed up LexicalResolve::expansion())
• Add long error explanation for E0584 #65493 (Add long error explanation for E0584)
• properly document panics in div_euclid and rem_euclid #65496 (properly document panics in div_euclid and rem_euclid)
• Plugins deprecation: don’t suggest simply removing the attribute #65498 (Plugins deprecation: don’t suggest simply removing the attribute)
• add option to ping llvm ice-breakers to triagebot #65508 (add option to ping llvm ice-breakers to triagebot)
• reorder fmt docs for more clarity #65513 (reorder fmt docs for more clarity)
• Update backtrace to 0.3.40 #65531 (Update backtrace to 0.3.40)

Failed merges:

• Add long error explanation for E0576 #65390 (Add long error explanation for E0576)
• Add long error explanation for E0577 #65434 (Add long error explanation for E0577)
• Add long error explanation for E0578 #65471 (Add long error explanation for E0578)
• Remove src/llvm-emscripten submodule #65501 (Remove src/llvm-emscripten submodule)

r? @ghost