Reviewers: Igor Sheludko,

Description:
[stubs] Optimize LoadGlobalViaContextStub and StoreGlobalViaContextStub.

This is the initial round of optimizations for the
LoadGlobalViaContextStub and StoreGlobalViaContextStub, basically
turning them into platform code stubs to avoid the Crankshaft overhead
in the fast case, and making the runtime interface cheaper.

[email protected]

Please review this at https://codereview.chromium.org/1238143002/

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

Affected files (+270, -327 lines):
  M src/code-stubs.h
  M src/code-stubs.cc
  M src/code-stubs-hydrogen.cc
  M src/compiler/js-generic-lowering.cc
  M src/interface-descriptors.h
  M src/interface-descriptors.cc
  M src/runtime/runtime.h
  M src/runtime/runtime-object.cc
  M src/x64/code-stubs-x64.cc
  M src/x64/full-codegen-x64.cc
  M src/x64/interface-descriptors-x64.cc
  M src/x64/macro-assembler-x64.h


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