r233223 - Make the msse4/mno-sse4 flags aliases of the maximum sse values

[Rafael Espíndola]

> +def mno_sse4 : Flag<["-"], "mno-sse4">, Alias<mno_sse4_1>;
...
> +def msse4 : Flag<["-"], "msse4">, Alias<msse4_2>;


The "mno" variant alias 4.1 but the "m" variant alias 4.2? This should
have a comment :-)

Cheers,
Rafael