[beta] next

[Mark-Simulacrum]

This backports:

• Avoid installing external LLVM dylibs Avoid installing external LLVM dylibs #78986
• Install CI llvm into the library directory Install CI llvm into the library directory #79074
• Revert "Revert "resolve: Avoid "self-confirming" import resolutions in one more case"" Revert "Revert "resolve: Avoid "self-confirming" import resolutions in one more case"" #78784
• Bump Rustfmt and RLS Bump Rustfmt and RLS #78775
• Enforce no-move rule of ReentrantMutex using Pin and fix UB in stdio Enforce no-move rule of ReentrantMutex using Pin and fix UB in stdio #77801

For RLS/rustfmt compilation to succeed:

• change the order of type arguments on ControlFlow change the order of type arguments on ControlFlow #76614
• Add ControlFlow::is_{break,continue} methods Add ControlFlow::is_{break,continue} methods #78200
• Replace run_compiler with RunCompiler builder pattern Replace run_compiler with RunCompiler builder pattern #77649

As a dependency of #77801:

• Add Pin::static_ref, static_mut. Add Pin::static_ref, static_mut. #77726