Add a late IR expansion pass for the experimental reduction intrinsics.

This pass uses a new target hook to decide whether or not to expand a particular
intrinsic to the shuffevector sequence.

Diff

Add a late IR expansion pass for the experimental reduction intrinsics.

This pass uses a new target hook to decide whether or not to expand a particular
intrinsic to the shuffevector sequence.

Differential Revision: https://reviews.llvm.org/D32245

llvm-svn: 302631

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