`lower_pattern_unadjusted`: simplify `Or(..)` branch.
`lower_pattern_unadjusted`: simplify `Or(..)` branch.

graydon/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust