[llvm] r208929 - Make the -L option for SaveTempLabels not be static. No functional change.

[Rafael Espíndola]

> Make the -L option for SaveTempLabels not be static. No functional change.
>
> Note: This option name is terrible, we should fix this.
>

The name is taken from the old OS X assembler, but I agree. llvm-mc is
not even close to being command line compatible with as and the OS X
assembler seems to be deprecated, so it is probably safe to rename the
llvm-mc option.

Cheers,
Rafael