Convert all named labels in asm!() blocks to anonymous labels

This fixes crashes in Mac OSX that appear to be caused by a bug in Rust when named labels are present in an asm!() block. It appears that any named label results in a Segmentation fault. Additionally, this allows for #[inline(never)] to be removed from all functions containing asm!() blocks with jumps which might result in better optimized code in some cases.

Closes #97