Reviewers: danno,

Description:
Merged r19535, r19549, r19586, r19584 into trunk branch.

Fix for a smi stores optimization on x64 with a regression test.

Fix for failing asserts in HBoundsCheck code generation on x64: index register
should be zero extended.

Fix putting of prototype transitions. The length is also subject to GC, just
like entry.

Handle arguments objects in frame when materializing arguments

BUG=345715,345820,347536,347262
LOG=N
[email protected]

Please review this at https://codereview.chromium.org/183353002/

SVN Base: https://v8.googlecode.com/svn/trunk

Affected files (+174, -34 lines):
  M src/deoptimizer.h
  M src/deoptimizer.cc
  M src/mark-compact.cc
  M src/objects.cc
  M src/version.cc
  M src/x64/disasm-x64.cc
  M src/x64/lithium-gap-resolver-x64.cc
  A + test/mjsunit/regress/regress-347262.js
  A test/mjsunit/regress/regress-crbug-345715.js
  A test/mjsunit/regress/regress-crbug-345820.js
  A test/mjsunit/regress/regress-put-prototype-transition.js


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