Reviewers: adamk, rossberg, wingo,

Message:
I could use a bit of help on this, I'm having trouble fixing the arrow functions
with rest parameters again in this version. PTAL when time permits

Description:
[es6] re-implement rest parameters via desugaring

Kills the kRestParameter bailout/disabled optimization, and fixes
lazily parsed arrow functions with rest parameters.

Supercedes https://crrev.com/1235153006/

BUG=508074, v8:2160, v8:2700
LOG=N
[email protected], [email protected], [email protected]

Please review this at https://codereview.chromium.org/1272673003/

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

Affected files (+135, -349 lines):
  M src/arm/code-stubs-arm.cc
  M src/arm64/code-stubs-arm64.cc
  M src/ast-value-factory.h
  M src/bailout-reason.h
  M src/code-stubs.h
  M src/code-stubs.cc
  M src/compiler/ast-graph-builder.h
  M src/compiler/ast-graph-builder.cc
  M src/compiler/linkage.cc
  M src/full-codegen/arm/full-codegen-arm.cc
  M src/full-codegen/arm64/full-codegen-arm64.cc
  M src/full-codegen/ia32/full-codegen-ia32.cc
  M src/full-codegen/x64/full-codegen-x64.cc
  M src/hydrogen.cc
  M src/ia32/code-stubs-ia32.cc
  M src/parser.h
  M src/parser.cc
  M src/preparser.h
  M src/runtime/runtime.h
  M src/runtime/runtime-scopes.cc
  M src/x64/code-stubs-x64.cc
  A + test/mjsunit/harmony/arrow-rest-params-lazy-parsing.js
  A test/mjsunit/harmony/regress/regress-508074.js


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