gallivm: remove LICM pass

LICM is simply too expensive, even though it presumably can help quite
a bit in some cases.
It was definitely cheaper in llvm 3.3, though as far as I can tell with
llvm 3.3 it failed to do anything in most cases. early-cse also actually
seems to cause licm to be able to move things when it previously couldn't,
which causes noticeable compile time increases.
There's more loop passes in llvm, but I'm not sure which ones are helpful,
and I couldn't find anything which would roughly do what the old licm in
llvm 3.3 did, so ditch it.

Reviewed-by: Jose Fonseca <[email protected]>

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