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Add option to enable MIR inlining independently of mir-opt-level Add `-Zinline-mir` option that enables MIR inlining independently of the current MIR opt level. The primary use-case is enabling MIR inlining on the default MIR opt level. Turn inlining thresholds into optional values to make it possible to configure different defaults depending on the current mir-opt-level (although thresholds are yet to be used in such a manner).