Add #[inline] to IpAddr methods

[AngelicosPhosphoros]

Add some inlines to trivial methods of IpAddr
Closes #77583

[rust-highfive]

r? @dtolnay

(rust-highfive has picked a reviewer for you, use r? to override)

[AngelicosPhosphoros]

Code from issue:

use std::net::{Ipv4Addr, Ipv6Addr};

pub fn ipv4_bitand_mask(ipv4: Ipv4Addr, mask: u32) -> Ipv4Addr {
    let ipv4_u32 = u32::from_ne_bytes(ipv4.octets());
    Ipv4Addr::from((ipv4_u32 & mask).to_ne_bytes())
}

pub fn ipv6_bitand_mask(ipv6: Ipv6Addr, mask: u128) -> Ipv6Addr {
    let ipv6_u128 = u128::from_ne_bytes(ipv6.octets());
    Ipv6Addr::from((ipv6_u128 & mask).to_ne_bytes())
}

Generated asm:

_ZN9inline_ip16ipv4_bitand_mask17h21a1d58399eeef05E:
	movl	%ecx, %eax
	andl	%edx, %eax
	retq

_ZN9inline_ip16ipv6_bitand_mask17h84a3a89719ccdfc1E:
	movq	%rcx, %rax
	andq	%r8, %rax
	andq	%r9, %rdx
	retq

I think, this change is very trivial.
cc @LeSeulArtichaut @mati865

[AngelicosPhosphoros]

r? @LeSeulArtichaut

[LeSeulArtichaut]

I'm not a reviewer. Maybe r? @m-ou-se

[AngelicosPhosphoros]

I'm not a reviewer.

Offtop: where can I find list of reviewers?

[m-ou-se]

Thanks!

@bors r+ rollup

Offtop: where can I find list of reviewers?

The list of reviewers that the high five bot will pick from is here:
https://github.com/rust-lang/highfive/blob/master/highfive/configs/rust-lang/rust.json#L14-L20

Everyone with bors review rights specifically for the library is listed here: https://www.rust-lang.org/governance/teams/library
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[bors]

📌 Commit a3d0fa8 has been approved by m-ou-se

[AngelicosPhosphoros]

Thanks for the reply.

Offtop: where can I find list of reviewers?

The list of reviewers that the high five bot will pick from is here:
https://github.com/rust-lang/highfive/blob/master/highfive/configs/rust-lang/rust.json#L14-L20

Everyone with bors review rights specifically for the library is listed here: https://www.rust-lang.org/governance/teams/library
(But some of them might only review changes related to a specific topic.)

(And people of the compiler team sometimes also approve library changes that don't affect the public api.)

[pickfire]

Should there be a test?

[AngelicosPhosphoros]

@pickfire You mean codegen test?

[pickfire]

Not sure what is it called but to test the generated assembly.

[m-ou-se]

I don't see much use in testing that every single #[inline] function in std is actually inlined.