Implement 'Sum' and 'Product' for 'f16' and 'f128';

Author: bjoernager

library/core/src/iter/traits/accum.rs

@@ -203,7 +203,7 @@ macro_rules! float_sum_product {
 
 integer_sum_product! { i8 i16 i32 i64 i128 isize u8 u16 u32 u64 u128 usize }
 saturating_integer_sum_product! { u8 u16 u32 u64 u128 usize }
-float_sum_product! { f32 f64 }
+float_sum_product! { f16 f32 f64 f128 }
 
 #[stable(feature = "iter_arith_traits_result", since = "1.16.0")]
 impl<T, U, E> Sum<Result<U, E>> for Result<T, E>