Rollup merge of rust-lang#89415 - wesleywiser:inliner_caller_callsite_message, r=michaelwoerister

Correct caller/callsite confusion in inliner message

`callee_body` is the MIR `Body` for the `callsite.callee` so this message basically says `"Inline {bar span} into bar"` when it should say `"Inline bar into foo"`.

Extracted out of rust-lang#82280

Author: Manishearth

compiler/rustc_mir_transform/src/inline.rs

@@ -147,7 +147,7 @@ impl Inliner<'tcx> {
         self.check_mir_body(callsite, callee_body, callee_attrs)?;
 
         if !self.tcx.consider_optimizing(|| {
-            format!("Inline {:?} into {}", callee_body.span, callsite.callee)
+            format!("Inline {:?} into {:?}", callsite.callee, caller_body.source)
         }) {
             return Err("optimization fuel exhausted");
         }