[Pre-RFC #2]: Inline assembly

I much prefer a solution which does not require the use of string literals like what I proposed here.

Not using string literals allows embedding Rust code directly in the assembly, which can be convenient. Letting inline assembly return value makes thing feel very Rust-like too, here's an example:

let val = asm {
	inw {reg => return}, {const = 0x40 + PORT_OFFSET}
};

I'm not a fan of Unix-style mesh together words like inlateout and those don't really fit with the naming conventions of Rust either.

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