stage2: remove `--verbose-mir` from help menu

removed in https://github.com/ziglang/zig/commit/5f97652da8881773b823a0730e5791816668528a
c37b40248cMeghan committed on 10/16/2022, 3:35:06 PM· committed by Andrew Kelleyparent99c3578
1 file changedLine totals unavailable