[Clang] [Sema] Combine fallout warnings to just one warning (#127546) This merges several falloff and noreturn-related warnings and removes unused diagnostic arguments. Changes: - `warn_maybe_falloff_nonvoid_function` and `warn_falloff_nonvoid_function`, `warn_maybe_falloff_nonvoid_coroutine` and `warn_falloff_nonvoid_coroutine`, `warn_maybe_falloff_nonvoid_lambda` and `warn_falloff_nonvoid_lambda` were combined into `warn_falloff_nonvoid`, - `err_maybe_falloff_nonvoid_block` and `err_falloff_nonvoid_block` were combined into `err_falloff_nonvoid` - `err_noreturn_block_has_return_expr` and `err_noreturn_lambda_has_return_expr` were merged into `err_noreturn_has_return_expr` with the same semantics as `warn_falloff_nonvoid` or `err_falloff_nonvoid`. - Removed some diagnostic args that weren’t being used by the diagnostics.
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