Update tests for const-eval error handling changes.

Author: pnkfelix

src/test/compile-fail/issue-18389.rs

@@ -22,7 +22,9 @@ trait Private<P: Pt, R: Rt> {
 pub trait Public: Private<
     <Self as Public>::P,
 //~^ ERROR illegal recursive type; insert an enum or struct in the cycle, if this is desired
+//~| ERROR illegal recursive type; insert an enum or struct in the cycle, if this is desired
     <Self as Public>::R
+//~^ ERROR illegal recursive type; insert an enum or struct in the cycle, if this is desired
 > {
     type P;
     type R;

src/test/compile-fail/issue-19244-1.rs

@@ -12,5 +12,7 @@ const TUP: (usize,) = (42,);
 
 fn main() {
     let a: [isize; TUP.1];
-    //~^ ERROR expected constant expr for array length: tuple index out of bounds
+    //~^ ERROR array length constant evaluation error: tuple index out of bounds
+    //~| ERROR attempted out-of-bounds tuple index
+    //~| ERROR attempted out-of-bounds tuple index
 }

src/test/compile-fail/issue-19244-2.rs

@@ -13,5 +13,7 @@ const STRUCT: MyStruct = MyStruct { field: 42 };
 
 fn main() {
     let a: [isize; STRUCT.nonexistent_field];
-    //~^ ERROR expected constant expr for array length: nonexistent struct field
+    //~^ ERROR array length constant evaluation error: nonexistent struct field
+    //~| ERROR attempted access of field `nonexistent_field`
+    //~| ERROR attempted access of field `nonexistent_field`
 }

src/test/compile-fail/non-constant-expr-for-fixed-len-vec.rs

@@ -13,6 +13,7 @@
 fn main() {
     fn bar(n: isize) {
         let _x: [isize; n];
-        //~^ ERROR expected constant expr for array length: non-constant path in constant expr
+        //~^ ERROR no type for local variable
+        //~| ERROR array length constant evaluation error: non-constant path in constant expr
     }
 }