Commits on Feb 14, 2017

1. deps: cherry-pick 7c982e7 from V8 upstream …

   Original commit message:
   
       PPC/s390: [Turbofan]: Use new MachineTypes in access-builder.
   
       Port 56429fc14671a10749190a4dfeacd38b7270f6f5
   
       Original Commit Message:
   
           Introduced MachineType::TaggedSigned() and TaggedPointer().
   
           The idea is to quit using the representational dimension of Type, and
           instead encode this information in the MachineRepresentation (itself
           lightly wrapped in MachineType, along with MachineSemantic).
   
           There are three parts to the whole change:
   
           1) Places that set the machine representation - constant nodes, loads nad
              stores, global object and native context specialization.
   
           2) Places that propagate type/representation - this is representation
              inference (aka simplified lowering). At the end of this process we
              expect to have a MachineRepresentation for every node. An interesting
              part of this is phi merging.
   
           3) Places that examine representation - WriteBarrier elimination does this.
              Currently it's looking at the Type representation dimension, but as
              a part of this change (or in a soon-to-follow change) it can simply
              examine the MachineRepresentation.
   
       R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
       BUG=
       LOG=N
   
       Review-Url: https://codereview.chromium.org/2662223003
       Cr-Commit-Position: refs/heads/master@{nodejs#42817}

   Jaideep Bajwa committed Feb 14, 2017
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