Normalize being an annoying little compile test

that keeps on erroring on less-common architectures.

Author: workingjubilee

tests/ui/limits/huge-struct.rs

@@ -1,7 +1,9 @@
+// ignore-tidy-linelength
 //@ build-fail
 //@ normalize-stderr-test: "S32" -> "SXX"
 //@ normalize-stderr-test: "S1M" -> "SXX"
-//@ error-pattern: too big for the current
+//@ normalize-stderr-32bit: "values of the type `[^`]+` are too big" -> "values of the type $$REALLY_TOO_BIG are too big"
+//@ normalize-stderr-64bit: "values of the type `[^`]+` are too big" -> "values of the type $$REALLY_TOO_BIG are too big"
 
 struct S32<T> {
     v0: T,

tests/ui/limits/huge-struct.stderr

@@ -1,5 +1,5 @@
-error: values of the type `SXX<SXX<S1k<SXX<SXX<u32>>>>>` are too big for the current architecture
-  --> $DIR/huge-struct.rs:46:9
+error: values of the type $REALLY_TOO_BIG are too big for the current architecture
+  --> $DIR/huge-struct.rs:48:9
    |
 LL |     let fat: Option<SXX<SXX<SXX<u32>>>> = None;
    |         ^^^