Reviewers: Toon Verwaest,

Message:
PTAL non-TF part (I'll ask TF team to review TF part later)

Description:
Loads and stores to global vars are now made via property cell shortcuts
installed into parent script context.

This CL also adds hydrogen stubs for global loads and global stores,
full-codegen and TurboFan now uses this machinery.

Please review this at https://codereview.chromium.org/1224793002/

Base URL: https://chromium.googlesource.com/v8/v8.git@master

Affected files (+1190, -156 lines):
  M src/arm/full-codegen-arm.cc
  M src/arm/interface-descriptors-arm.cc
  M src/arm64/full-codegen-arm64.cc
  M src/arm64/interface-descriptors-arm64.cc
  M src/ast.h
  M src/ast.cc
  M src/code-factory.h
  M src/code-factory.cc
  M src/code-stubs.h
  M src/code-stubs.cc
  M src/code-stubs-hydrogen.cc
  M src/compiler/ast-graph-builder.h
  M src/compiler/ast-graph-builder.cc
  M src/compiler/js-generic-lowering.cc
  M src/compiler/js-operator.h
  M src/compiler/js-operator.cc
  M src/compiler/js-typed-lowering.cc
  M src/hydrogen.h
  M src/hydrogen.cc
  M src/hydrogen-instructions.h
  M src/ia32/full-codegen-ia32.cc
  M src/ia32/interface-descriptors-ia32.cc
  M src/interface-descriptors.h
  M src/interface-descriptors.cc
  M src/mips/full-codegen-mips.cc
  M src/mips/interface-descriptors-mips.cc
  M src/mips64/full-codegen-mips64.cc
  M src/mips64/interface-descriptors-mips64.cc
  M src/ppc/full-codegen-ppc.cc
  M src/ppc/interface-descriptors-ppc.cc
  M src/runtime/runtime.h
  M src/runtime/runtime-object.cc
  M src/scopes.cc
  M src/x64/full-codegen-x64.cc
  M src/x64/interface-descriptors-x64.cc
  M src/x87/full-codegen-x87.cc
  M src/x87/interface-descriptors-x87.cc
  M test/unittests/compiler/js-type-feedback-unittest.cc
  M test/unittests/compiler/js-typed-lowering-unittest.cc


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