fix 32bit-only test

src/test/ui/huge-array-simple-32.rs

@@ -4,7 +4,7 @@
 // FIXME https://github.com/rust-lang/rust/issues/59774
 // normalize-stderr-test "thread.*panicked.*Metadata module not compiled.*\n" -> ""
 // normalize-stderr-test "note:.*RUST_BACKTRACE=1.*\n" -> ""
-#![allow(exceeding_bitshifts)]
+#![allow(arithmetic_overflow)]
 
 fn main() {
     let _fat: [u8; (1<<31)+(1<<15)] = //~ ERROR too big for the current architecture