Add 'aggressive' keyword for pragma loop hints

[Tyler Nowicki]

Hi,

This patch (0003) adds support for the keyword aggressive to be used with pragma loop hints. Specifying aggressive for vectorize or interleave will add mem.parallel_loop_access metadata to loads/stores within the loop. This uses the LoopInfo InsertHelper provided for OpenMP.

The new pragma syntax:

#pragma clang loop vectorize(aggressive) interleave(aggressive)

The metadata vectorize.enable will be modified in a follow-up patch to an integer. 0 - disable, 1 - enable, 2 - aggressive. This will be combined with an LLVM patch to identify the aggressive option and override the cost model, and potentially other restrictions on vectorization/interleaving.

Patch 0001 moves some pragma loop hints to the correct folder and 0002 fixes a small diagnostic bug.

Tyler

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