ReadBytesAsPointer is always supported

Author: RalfJung

src/diagnostics.rs

@@ -92,6 +92,8 @@ pub fn report_error<'tcx, 'mir>(
             let helps = match e.kind {
                 Unsupported(UnsupportedOpInfo::NoMirFor(..)) =>
                     vec![format!("make sure to use a Miri sysroot, which you can prepare with `cargo miri setup`")],
+                Unsupported(UnsupportedOpInfo::ReadBytesAsPointer) =>
+                    panic!("`ReadBytesAsPointer` cannot be raised by Miri"),
                 Unsupported(_) =>
                     vec![format!("this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support")],
                 UndefinedBehavior(UndefinedBehaviorInfo::AlignmentCheckFailed { .. }) =>