Rollup merge of #105234 - JakobDegen:unneeded-field, r=oli-obk

Remove unneeded field from `SwitchTargets`

This had a fixme already. The only change in behavior is that the mir dumps now no longer contains labels for the types of the integers on the edges of a switchint:

Before:
![image](https://user-images.githubusercontent.com/51179609/205467622-34401a68-dca6-43eb-915e-b9fda1988860.png)

After:
![image](https://user-images.githubusercontent.com/51179609/205467634-b5b2a259-9cb4-4843-845c-592c500f0f9c.png)

I don't think that's a problem though. The information is still available to a user that really cares by checking the type of `_2`, so it honestly feels like a bit of an improvement to me.

r? mir

1 files changed, 1 insertions, 1 deletions

diff --git a/src/test/mir-opt/lower_array_len.array_bound.NormalizeArrayLen.diff b/src/test/mir-opt/lower_array_len.array_bound.NormalizeArrayLen.diff
index 049bbeac867..9bc7060e958 100644
--- a/src/test/mir-opt/lower_array_len.array_bound.NormalizeArrayLen.diff
+++ b/src/test/mir-opt/lower_array_len.array_bound.NormalizeArrayLen.diff
@@ -38,7 +38,7 @@
           _3 = Lt(move _4, move _5);       // scope 0 at $DIR/lower_array_len.rs:+1:8: +1:27
           StorageDead(_5);                 // scope 0 at $DIR/lower_array_len.rs:+1:26: +1:27
           StorageDead(_4);                 // scope 0 at $DIR/lower_array_len.rs:+1:26: +1:27
-          switchInt(move _3) -> [false: bb4, otherwise: bb2]; // scope 0 at $DIR/lower_array_len.rs:+1:8: +1:27
+          switchInt(move _3) -> [0: bb4, otherwise: bb2]; // scope 0 at $DIR/lower_array_len.rs:+1:8: +1:27
       }
   
       bb2: {