[X86] Constant folding of adds/subs intrinsics
Summary: This adds constant folding of signed add/sub with saturation intrinsics. Reviewers: craig.topper, spatel, RKSimon, chandlerc, efriedma Reviewed By: craig.topper Subscribers: rnk, llvm-commits Differential Revision: https://reviews.llvm.org/D50499 llvm-svn: 339659
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