core: Audit num module for int/uint

* count_ones/zeros, trailing_ones/zeros return u32, not usize
* rotate_left/right take u32, not usize
* RADIX, MANTISSA_DIGITS, DIGITS, BITS, BYTES are u32, not usize

Doesn't touch pow because there's another PR for it.

[breaking-change]

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libstd/num/strconv.rs b/src/libstd/num/strconv.rs
index f6d05f961e1..ca2e6ba5d5d 100644
--- a/src/libstd/num/strconv.rs
+++ b/src/libstd/num/strconv.rs
@@ -253,7 +253,7 @@ pub fn float_to_str_bytes_common<T: Float>(
         deccum = deccum / radix_gen;
         deccum = deccum.trunc();
 
-        buf.push(char::from_digit(current_digit.to_int().unwrap() as u32, radix)
+        buf.push(char::from_digit(current_digit.to_isize().unwrap() as u32, radix)
              .unwrap() as u8);
 
         // No more digits to calculate for the non-fractional part -> break
@@ -310,7 +310,7 @@ pub fn float_to_str_bytes_common<T: Float>(
             let current_digit = deccum.trunc().abs();
 
             buf.push(char::from_digit(
-                current_digit.to_int().unwrap() as u32, radix).unwrap() as u8);
+                current_digit.to_isize().unwrap() as u32, radix).unwrap() as u8);
 
             // Decrease the deccumulator one fractional digit at a time
             deccum = deccum.fract();