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deps: cherry-pick 7c982e7 from V8 upstream

Rodrigo Muino Tomonari requested to merge github/fork/jbajwa/v7.x-staging into v7.x-staging

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@{#42817}
Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines
Affected core subsystem(s)

V8

Description of change

This port is in V8 5.6/5.7 but couldn't make it to V8 5.5. When node master moves to 5.6, it should have this commit, so only affects node version with V8 5.5

/cc @nodejs/v8

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