Auto merge of #116935 - oli-obk:different_lifetime_taits_in_same_sig, r=compiler-errors

Prevent opaque types being instantiated twice with different regions within the same function

addresses https://github.com/orgs/rust-lang/projects/22/views/1?pane=issue&itemId=41329537

r? `@compiler-errors`

Author: bors