Auto merge of #75076 - tmiasko:simplify-goto, r=oli-obk

Fix change detection in CfgSimplifier::collapse_goto_chain

Check that the old target is different from the new collapsed one, before concluding that anything changed.

Fixes #75074
Fixes #75051

src/test/ui/issues/issue-75704.rs

@@ -0,0 +1,7 @@
+// Caused an infinite loop during SimlifyCfg MIR transform previously.
+//
+// build-pass
+
+fn main() {
+    loop { continue; }
+}