Auto merge of #116386 - elichai:patch-2, r=thomcc

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)

0 files changed, 0 insertions, 0 deletions