mir_enable_passes

use like -Zmir-enable-passes=+DestinationPropagation,-InstSimplify. Forces the specified passes to be enabled, overriding all other checks. In particular, this will enable unsound (known-buggy and hence usually disabled) passes without further warning! Passes that are not specified are enabled or disabled by other flags as usual.

This feature has no tracking issue, and is therefore likely internal to the compiler, not being intended for general use.