Rollup merge of #142012 - oli-obk:no-optional-spans, r=fee1-dead

Replace some `Option<Span>` with `Span` and use DUMMY_SP instead of None

Turns out many locations actually have a span available that we could use, so I used it

Author: matthiaskrgr

src/shims/panic.rs

@@ -247,7 +247,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
 
             _ => {
                 // Call the lang item associated with this message.
-                let fn_item = this.tcx.require_lang_item(msg.panic_function(), None);
+                let fn_item = this.tcx.require_lang_item(msg.panic_function(), this.tcx.span);
                 let instance = ty::Instance::mono(this.tcx.tcx, fn_item);
                 this.call_function(
                     instance,