Add test for denying overflowing literal in loop

src/test/ui/lint/deny-overflowing-literals.rs

@@ -1,4 +1,7 @@
 fn main() {
     let x: u8 = 256;
     //~^ error: literal out of range for `u8`
+
+    for _ in 0..256u8 {}
+    //~^ error: range endpoint is out of range for `u8`
 }

src/test/ui/lint/deny-overflowing-literals.stderr

@@ -6,5 +6,11 @@ LL |     let x: u8 = 256;
    |
    = note: #[deny(overflowing_literals)] on by default
 
-error: aborting due to previous error
+error: range endpoint is out of range for `u8`
+  --> $DIR/deny-overflowing-literals.rs:5:14
+   |
+LL |     for _ in 0..256u8 {}
+   |              ^^^^^^^^ help: use an inclusive range instead: `0..=255u8`
+
+error: aborting due to 2 previous errors