less confusing wording

Co-authored-by: Ben Kimock <kimockb@gmail.com>

Author: RalfJung

tests/ui/layout/size-of-val-raw-too-big.rs

@@ -21,9 +21,9 @@ extern "rust-intrinsic" {
 }
 
 // We guarantee that with length 0, `size_of_val_raw` (which calls the `size_of_val` intrinsic)
-// is safe to call. The compiler aborts execution if a length of 0 would overflow.
+// is safe to call. The compiler aborts compilation if a length of 0 would overflow.
 // So let's construct a case where length 0 just barely overflows, and ensure that
-// does abort execution.
+// does abort compilation.
 pub fn check(x: *const Example) {
     unsafe { size_of_val(x); }
 }