[PATCH] Allow loop vectorization with llvm.lifetime calls

[Jessome, Marc]

Hello,

This patch will allow vectorization of loops which contain calls to llvm.lifetime start/end. In order to preserve lifetime information across the loop, that call to llvm.lifetime.* is emit into the vectorized loop body.

In this patch, the special-casing of these intrinsic calls was done since there is no ready way to:  1. differentiate non-vectorized calls during loop body construction, and 2. differentiate Intrinsic calls vs. intrinsic instructions while costing. Perhaps someone with a bit more experience in the area could point me in a better direction here.

Marc
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