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[legalize-types] Remove stale entries from SoftenedFloats.
Summary: When replacing a SDValue, we should remove the replaced value from SoftenedFloats (and possibly the other maps as well?). When we revisit a Node because it needs analyzing again, we have to remove all result values from SoftenedFloats (and possibly other maps?). This fixes the fp128 test failures with expensive checks for X86. I think we probably should also remove the values from the other maps (PromotedIntegers and so on), let me know what you think. Reviewers: baldrick, bogner, davidxl, ab, arsenm, pirama, chh, RKSimon Reviewed By: chh Subscribers: danalbert, wdng, srhines, hfinkel, sepavloff, llvm-commits Differential Revision: https://reviews.llvm.org/D29265 llvm-svn: 296964
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