replace & with && in {integer}::checked_div

Using short-circuit operators makes it easier to perform some kinds of
source code analysis, like MC/DC code coverage (a requirement in
safety-critical environments). The optimized x86 assembly is the same
between the old and new versions:

```
xor eax, eax
test esi, esi
je .LBB0_1
cmp edi, -2147483648
jne .LBB0_4
cmp esi, -1
jne .LBB0_4
ret
.LBB0_1:
ret
.LBB0_4:
mov eax, edi
cdq
idiv esi
mov edx, eax
mov eax, 1
ret
```

Author: pietroalbini

library/core/src/num/int_macros.rs

@@ -608,8 +608,7 @@ macro_rules! int_impl {
                       without modifying the original"]
         #[inline]
         pub const fn checked_div(self, rhs: Self) -> Option<Self> {
-            // Using `&` helps LLVM see that it is the same check made in division.
-            if unlikely!(rhs == 0 || ((self == Self::MIN) & (rhs == -1))) {
+            if unlikely!(rhs == 0 || ((self == Self::MIN) && (rhs == -1))) {
                 None
             } else {
                 // SAFETY: div by zero and by INT_MIN have been checked above