Enable NLL migrate mode on the 2015 edition ## What is in this PR? * Remove the `-Zborrowck=ast` flag option from rustc. * The default in the 2015 edition is now `-Zborrowck=migrate`. * The 2018 edition default is unchanged: it's still `-Zborrowck=migrate`. * Enable two-phase borrows (currently toggled via the `-Ztwo-phase-borrows` flag) on all editions. * Remove most dead code that handled these options. * Update tests for the above changes. ## What is *not* in this PR? These are left for future PRs * Use `-Zborrowck=mir` in NLL compare mode tests (#56993) * Remove the `-Zborrowck=compare` option (#59193) * Remove the `-Ztwo-phase-borrows` flag. It's kept, as a flag that does nothing so that perf.rlo has time to stop using it (cc @Mark-Simulacrum) * Remove MIR typeck as its own MIR pass - it's now run by NLL. * Enabling `-Zborrowck=mir` by default (#58781) * Replace `allow_bind_by_move_patterns_with_guards` and `check_for_mutation_in_guard_via_ast_walk` with just using the feature gate. (#59192) Soundness issues that are fixed by NLL will stay open until full NLL is emitting hard errors. However, these diagnostics and completeness issues can now be closed: Closes #18330 Closes #22323 Closes #23591 Closes #26736 Closes #27487 Closes #28092 Closes #28970 Closes #29733 Closes #30104 Closes #38915 Closes #39908 Closes #43407 Closes #47524 Closes #48540 Closes #49073 Closes #52614 Closes #55085 Closes #56093 Closes #56496 Closes #57804 cc #43234 r? @pnkfelix cc @rust-lang/lang cc @rust-lang/wg-compiler-nll

Simplify handling of feature(bind_by_move_pattern_guards) #59192

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