Add 85907

Issue: rust-lang/rust#85907

Author: fanninpm

ices/85907.rs

@@ -0,0 +1,9 @@
+#![feature(const_panic)]
+
+const fn hey() -> usize {
+    panic!(123);
+}
+
+fn main() {
+    let _: [u8; hey()] = todo!();
+}