fix test on 32 bit systems

src/test/ui/const_evaluatable/function-call.rs

@@ -1,8 +1,9 @@
 // check-pass
-#![warn(const_evaluatable_unchecked)]
 
 const fn foo<T>() -> usize {
-    if std::mem::size_of::<*mut T>() < 8 { // size of *mut T does not depend on T
+    // We might instead branch on `std::mem::size_of::<*mut T>() < 8` here,
+    // which would cause this function to fail on 32 bit systems.
+    if false {
         std::mem::size_of::<T>()
     } else {
         8

src/test/ui/const_evaluatable/function-call.stderr

@@ -1,14 +1,10 @@
 warning: cannot use constants which depend on generic parameters in types
-  --> $DIR/function-call.rs:13:17
+  --> $DIR/function-call.rs:14:17
    |
 LL |     let _ = [0; foo::<T>()];
    |                 ^^^^^^^^^^
    |
-note: the lint level is defined here
-  --> $DIR/function-call.rs:2:9
-   |
-LL | #![warn(const_evaluatable_unchecked)]
-   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = note: `#[warn(const_evaluatable_unchecked)]` on by default
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #76200 <https://github.com/rust-lang/rust/issues/76200>