Auto merge of #23127 - alexcrichton:bench-wrapping, r=brson

Right now the rust upgrade in cargo is blocked on fixing this overflow. If a
this benchmark is run it will trigger an overflow error today:

    #[bench]
    fn foo(b: &mut test::Bencher) {}

This commit adds a check on each iteration of the loop that the maximum
multiplier (10) doesn't overflow, and if it does just return the results so far.

src/libtest/lib.rs

@@ -1109,7 +1109,14 @@ pub fn auto_bench<F>(&mut self, mut f: F) -> stats::Summary<f64> where F: FnMut(
                 return summ5;
             }
 
-            n *= 2;
+            // If we overflow here just return the results so far. We check a
+            // multiplier of 10 because we're about to multiply by 2 and the
+            // next iteration of the loop will also multiply by 5 (to calculate
+            // the summ5 result)
+            n = match n.checked_mul(10) {
+                Some(_) => n * 2,
+                None => return summ5,
+            };
         }
     }
 }