Rebase simd from M37 to M38

Cherry pick simd commits from master to next branch, and fix build and tests error.

Those include follow six commits:
commit 5aa07fb60139abfc847c4398c1b9c252711b2ce0
Author: Ningxin Hu <ningxin.hu@intel.com>
Date:   Fri Aug 8 23:54:14 2014 -0700

    Fix invalid native context reference in simd128-tag
    
    The solution is to inline the native context load.
    
    BUG=XWALK-2255

commit 11af0678615217b5dce34e7e7d6a3257a2918ca4
Author: Ningxin Hu <ningxin.hu@intel.com>
Date:   Sun Jul 27 03:43:34 2014 -0700

    Inline the simd128-tag
    
    Implement the simd128-tag inlining for the new JSObject-based
    SIMD128 types' layout.
    
    TODO(ningxin): squash into patch-2

commit 19a1909de10a23132cd6841f13b8699e5fe5b5a3 
Author: Ningxin Hu <ningxin.hu@intel.com>
Date:   Mon Jul 28 03:39:14 2014 +0800

    Fix the presubmit step
    
    - Fix the runtime function test auto generation.
    - Fix the coding style issues.
    
    TODO(ningxin): squash into patch 1
    
commit 0b384992a5e432758cb791b22e9264a23d2be697         
Author: Haitao Feng <haitao.feng@intel.com>
Date:   Wed Mar 5 15:33:11 2014 +0800

    Inline all SIMD operations and optimize the SIMD arrays load and store.
    
...skipping...
    Optimize Float32x4Array, Float64x2Array and Int32x4Array element loading
    and storing for ia32 and x64 port by:
      1). Allocating SIMD128 registers
      2). Emitting SIMD movups instruction
      3). Adding deoptimization support for SIMD128 registers or stack slots
    
    Inline all SIMD operations and emit SIMD instructions for ia32 and x64 port

commit 6abf4e59af44c4c0f1efc50a0e924f0d14f608ae
Author: Ningxin Hu <ningxin.hu@intel.com>
Date:   Fri Jul 25 19:40:02 2014 -0700

    Change Float32x4, Float64x2 and Int32x4 to JSObject.
    
    These objects contains a "value" pointer pointing to a corresponding
    FixedTypedArray which is the real data storage.

commit a8f3875fc8a08500ddfee3994d08b63d7f19c5a7
Author: Haitao Feng <haitao.feng@intel.com>
Date:   Wed Feb 26 12:45:08 2014 +0800

    Introduce Float32x4, Float64x2, Int32x4, Float32x4Array, Float64x2Array
    and Int32x4Array data types, implement the SIMD operations on the
    Float32x4, Float64x2 and Int32x4 with C++ runtime functions and implement
    Float32x4Array, Float64x2Array and Int32x4Array element loading and storing.