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    • mvstanton's avatar
      [turbofan] Don't propagate truncations if output is tagged. · 8af781ea
      mvstanton authored
      Disable the propagation of truncations through Phi, Select or TypeGuard
      if the output representation is tagged, because when the truncations are
      taken we don't necessarily reflect this in the types and therefore we
      might end up in a situation where we produce a word32 value, the type
      says Number, and now we need to change that to tagged, which is not
      possible since we don't know how to interpret the bits, i.e. whether the
      value is Signed32 or Unsigned32.
      
      BUG=chromium:644048
      
      Review-Url: https://codereview.chromium.org/2311903002
      Cr-Commit-Position: refs/heads/master@{#39186}
      8af781ea