4910642aab
Add missing inline attributes to Duration trait impls
Currently `Duration::checked_add` is marked `#[inline]` but it's trait relative `Add::add` is not.
Leading to a case where:
```rust
pub fn foo() -> Duration {
Duration::from_secs(10) + Duration::from_millis(6)
}
pub fn bar() -> Duration {
Duration::from_secs(10).checked_add(Duration::from_millis(6)).expect("overflow when adding durations")
}
```
compiles to:
```asm
playground::foo:
movl $10, %edi
xorl %esi, %esi
xorl %edx, %edx
movl $6000000, %ecx
jmpq *<core::time::Duration as core::ops::arith::Add>::add@GOTPCREL(%rip)
playground::bar:
movl $10, %eax
movl $6000000, %edx
retq
```
(The same happens for all arithmetic operation)