Add more normalization and tests

Author: mejrs

tests/ui/track-diagnostics.rs

@@ -1,6 +1,10 @@
 // compile-flags: -Z track-diagnostics
 // error-pattern: created at
 
+// Normalize the emitted location so this doesn't need
+// updating everytime someone adds or removes a line.
+// normalize-stderr-test ".rs:\d+:\d+" -> ".rs:$$LINE::$$COL"
+
 struct A;
 struct B;
 const S: A = B;

tests/ui/track-diagnostics.stderr

@@ -1,9 +1,9 @@
 error[E0308]: mismatched types
-  --> $DIR/track-diagnostics.rs:6:14
+  --> $DIR/track-diagnostics.rs:$LINE::$COL
    |
 LL | const S: A = B;
    |              ^ expected struct `A`, found struct `B`
--Ztrack-diagnostics: created at compiler/rustc_infer/src/infer/error_reporting/mod.rs:2275:31
+-Ztrack-diagnostics: created at compiler/rustc_infer/src/infer/error_reporting/mod.rs:$LINE::$COL
 
 error: aborting due to previous error