Reviewers: adamk, titzer,

Message:
I couldn't figure out how to run the Turbofan tests. tools/run-tests.py didn't
seem to work. Any suggestions?

The current code only includes x64 support; I'll fill in the others after this
initial review.

Description:
Inline code generation for %_IsTypedArray

This patch implements %_IsTypedArray in fullcodegen, Hydrogen and
Turbofan in order to implement fast type checks to enable ES6
TypedArray features and semantics efficiently.

R=adamk,titzer
LOG=Y
BUG=v8:4085

Please review this at https://codereview.chromium.org/1183213002/

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

Affected files (+86, -19 lines):
  M src/compiler/js-intrinsic-lowering.cc
  M src/full-codegen.h
  M src/harmony-typedarray.js
  M src/hydrogen.h
  M src/hydrogen.cc
  M src/typedarray.js
  M src/x64/full-codegen-x64.cc
  M test/unittests/compiler/js-intrinsic-lowering-unittest.cc


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