Sanjay Patel e50059f6b6 [x86] form reduction intrinsics from vectorizers instead of raw IR
Motivating examples are seen in the PhaseOrdering tests based on:
https://bugs.llvm.org/show_bug.cgi?id=43953#c2 - if we have
intrinsics there, some pass can fold them.

The intrinsics are still named "experimental" at this point, but
if there is no fallout from this patch, that will be a good
indicator that it is safe to finalize them.

Differential Revision: https://reviews.llvm.org/D80867
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