add missing stderr reports

tests/ui/consts/issue-17718-const-bad-values.stderr

@@ -7,8 +7,8 @@ LL | const C1: &'static mut [usize] = &mut [];
 error[E0080]: it is undefined behavior to use this value
   --> $DIR/issue-17718-const-bad-values.rs:7:1
    |
-LL | const C2: &'static mut usize = unsafe { &mut S };
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered reference to mutable memory in `const`
+LL | const C2: &'static mut i32 = unsafe { &mut S };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered reference to mutable memory in `const`
    |
    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
    = note: the raw bytes of the constant (size: 8, align: 8) {

tests/ui/consts/no-ice-from-static-in-const-issue-52060.stderr

@@ -0,0 +1,9 @@
+error[E0080]: evaluation of constant value failed
+  --> $DIR/no-ice-from-static-in-const-issue-52060.rs:5:35
+   |
+LL | static B: [u32; 1] = [0; unsafe { A.len() }];
+   |                                   ^ constant accesses mutable global memory
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0080`.