Commits on Dec 29, 2018

1. deps: V8: cherry-pick 56f6a76 …

   Original commit message:
   
       [turbofan] Fix -0 check for subnormals.
   
       Previously we'd check `x` for -0 by testing `(1.0 / x) == -Infinity`,
       but this will yield the wrong results when `x` is a subnormal, i.e.
       really close to 0.
   
       In CSA we already perform bit checks to test for -0, so teach TurboFan
       to do the same for comparisons to -0 (via `Object.is`). We introduce a
       new NumberIsMinusZero simplified operator to handle the case where
       SimplifiedLowering already knows that the input is a number.
   
       Bug: chromium:903043, v8:6882
       Change-Id: I0cb7c568029b461a92fc183104d5f359b4bfe7f4
       Reviewed-on: https://chromium-review.googlesource.com/c/1328802
       Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
       Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
       Cr-Commit-Position: refs/heads/master@{#57382}
   
   Refs: v8/v8@56f6a76

   

   BridgeAR committed Dec 29, 2018
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