As per #2521. Inlining seems to improve performance slightly:

                 Inlined          Not Inlined
    x86:         13.5482            14.4112
    x86_64:      17.4712            18.0696

(Average of 5 runs timed with `time`)

```Rust

fn foo() -> int {
    int::from_str(~"28098").unwrap()
}

fn main() {
    for 1000000.times {
        foo();
        foo();
        foo();
        foo();
        foo();
    }
}
```

All run on:

    Linux 3.2.0-0.bpo.4-amd64 #1 SMP Debian 3.2.35-2~bpo60+1 x86_64 GNU/Linux

The MIPS and ARM bits I didn't inline since I'm not as familiar with them and I also can't test them. All green on try.

…l, r=flip1995

Incorrect suspicious_op_assign_impl

fixes rust-lang#5255

changelog: In suspicious_op_assign_impl ignore all operators in expression if it's part of AssignOp

Rollup of 11 pull requests

Successful merges:

 - rust-lang#5406 (Fix update_lints)
 - rust-lang#5409 (Downgrade let_unit_value to pedantic)
 - rust-lang#5410 (Downgrade trivially_copy_pass_by_ref to pedantic)
 - rust-lang#5412 (Downgrade inefficient_to_string to pedantic)
 - rust-lang#5415 (Add new lint for `Result<T, E>.map_or(None, Some(T))`)
 - rust-lang#5417 (Update doc links and mentioned names in docs)
 - rust-lang#5419 (Downgrade unreadable_literal to pedantic)
 - rust-lang#5420 (Downgrade new_ret_no_self to pedantic)
 - rust-lang#5422 (CONTRIBUTING.md: fix broken triage link)
 - rust-lang#5424 (Incorrect suspicious_op_assign_impl)
 - rust-lang#5425 (Ehance opt_as_ref_deref lint.)

Failed merges:

 - rust-lang#5345 (Add lint for float in array comparison)
 - rust-lang#5411 (Downgrade implicit_hasher to pedantic)
 - rust-lang#5428 (Move cognitive_complexity to nursery)

r? @ghost

changelog: rollup