MIPS64: Fix 'Expose SIMD.Float32x4 type to Javascript.'

MIPS64: Fix 'Expose SIMD.Float32x4 type to Javascript.'

Port e5ed3bee99807c502fa7d7a367ec401e16d3f773

Original commit message:
This CL exposes the constructor function, defines type related
information, and implements value type semantics.
It also refactors test/mjsunit/samevalue.js to test SameValue and SameValueZero.

TEST=test/mjsunit/harmony/simd.js, test/cctest/test-simd.cc

LOG=Y
BUG=v8:4124

[balazs.kilvady, 2015-07-16 10:57:38]

balazs.kilvady@imgtec.com changed reviewers:
+ akos.palfi@imgtec.com, bbudge@chromium.org, danno@chromium.org,
dusan.milosavljevic@imgtec.com, paul.lind@imgtec.com

[bbudge, 2015-07-16 15:56:04]

Thanks for catching this.

My change got reverted and I'm trying to reland it. I incorporated your change
in this version. Let me know if you prefer that I leave it out so you can land
this CL.

[balazs.kilvady, 2015-07-16 16:38:31]

On 2015/07/16 15:56:04, bbudge wrote:
> Thanks for catching this.
> 
> My change got reverted and I'm trying to reland it. I incorporated your change
> in this version. Let me know if you prefer that I leave it out so you can land
> this CL.

We (and V8 team also) prefer if you include MIPS changes in your CL. Later it is
easier to revert/reland it if all the ports are in one CL. Next time if you have
a complicated CL than we will be happy to help you with doing the MIPS/MIPS64
part (that you can merge in) before you land your CL.

[bbudge, 2015-07-16 16:50:41]

I omitted that stub unintentionally. I was actually trying to make all
architectures work.

I will reland with your patch included. Thanks again!