[PATCH][X86][Haswell][SchedModel] Add exceptions for instructions that diverge from the generic model.

[Quentin Colombet]

Hi,

This series of patches adds an exception for each instruction that diverges from the generic scheduling model.
It follows the structure of Agner Fog’s instructions tables and provides a patch for each sub-group.

Although I had observed changes of the schedule of some test cases in the llvm-testsuite + SPECs, I had not measured anything than noise.
Note: I have measured both ‘-O3 -march=native' and ‘-Os -march=native’ on a Haswell machine.

Thanks for your reviews.

-Quentin
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