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Rollup merge of #77322 - rust-lang:wesleywiser-patch-1, r=steveklabnik 

Add unstable book docs for `-Zunsound-mir-opts`

The `-Zunsound-mir-opts` flag was added in #76899.
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Jonas Schievink 2020-09-30 20:56:14 +02:00 committed by GitHub
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src/doc/unstable-book/src/compiler-flags/unsound-mir-opts.md Normal file
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# `unsound-mir-opts`
--------------------
The `-Zunsound-mir-opts` compiler flag enables [MIR optimization passes] which can cause unsound behavior.
This flag should only be used by MIR optimization tests in the rustc test suite.
[MIR optimization passes]: https://rustc-dev-guide.rust-lang.org/mir/optimizations.html