Auto merge of #15270 - ChristianSchott:patch-1, r=HKalbasi

Make fields of mir::Terminator public

When trying to use the RA crate, I am unable to access the fields in `hir_def::mir::Terminator`.
I don't see any reason, why these should be private, especially as the fields of `hir_def::mir::Statement` are `pub`.

I am not sure if the fields in `hir_def::mir::SwitchTargets` should be made `pub` too, but at least they are read-accessible via some public methods..

Sorry if I missed something, this is my first PR.

crates/hir-ty/src/mir.rs

@@ -323,8 +323,8 @@ pub fn target_for_value(&self, value: u128) -> BasicBlockId {
 
 #[derive(Debug, PartialEq, Eq, Clone)]
 pub struct Terminator {
-    span: MirSpan,
-    kind: TerminatorKind,
+    pub span: MirSpan,
+    pub kind: TerminatorKind,
 }
 
 #[derive(Debug, PartialEq, Eq, Clone)]