[patch] Rename llvm cpu features to match gcc option names

[Rafael Espíndola]

Would anyone have a problem with me renaming some llvm features to
match the gcc (and clang) command line options? The renames are

* sse41 -> sse4.1
* sse42 -> sse4.2
* rdrand -> rdrnd

Doing so simplifies clang a bit.

Cheers,
Rafael
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