Add SIMD.Float32x4 functions.

Add all SIMD.float32x4 functions that can be implemented without the other SIMD types.

constructor, splat constructor
check
extractLane, replaceLane
abs, neg, sqrt, reciprocalApproximation, reciprocalSqrtApproximation
add, sub, mul, div, min, max, minNum, maxNum
swizzle, shuffle

Includes a patch to the test harness for console.log output.

LOG=N
BUG=v8:4124

[bbudge, 2015-06-09 19:59:20]

Patchset #1 (id:1) has been deleted

[bbudge, 2015-06-10 01:04:29]

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[bbudge, 2015-06-10 18:48:11]

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[bbudge, 2015-06-11 22:56:57]

bbudge@chromium.org changed reviewers:
+ rossberg@chromium.org

[rossberg, 2015-06-12 11:48:03]

Mostly looking good, except that it is missing plenty of tests. Some features
are obviously not working yet (e.g. equality, typeof, etc), but for the value
behaviour that this CL implements we need tests (in
test/mjsunit/harmony/simd.js), e.g.:

- variants of constructor calls
- prototype identities
- object wrapping
- ClassOf
- explicit & implicit conversions (especially to primitive types)

See e.g. the first half of test/mjsunit/es6/symbols.js for guidance.

I assume the actual SIMD methods are already tested in the SIMD suite.

https://codereview.chromium.org/1160443009/diff/140001/include/v8.h
File include/v8.h (right):

https://codereview.chromium.org/1160443009/diff/140001/include/v8.h#newcode3836
include/v8.h:3836: class V8_EXPORT Float32x4 : public Object {
SIMDs aren't objects, so this needs to derive from Value.

https://codereview.chromium.org/1160443009/diff/140001/src/harmony-simd.js
File src/harmony-simd.js (right):

https://codereview.chromium.org/1160443009/diff/140001/src/harmony-simd.js#ne...
src/harmony-simd.js:113: %FunctionSetPrototype(GlobalFloat32x4, new
GlobalObject());
Nit: s/new GlobalObject()/{}/

https://codereview.chromium.org/1160443009/diff/140001/src/harmony-simd.js#ne...
src/harmony-simd.js:119: %AddNamedProperty(GlobalFloat32x4, symbolToStringTag,
'float32x4', READ_ONLY | DONT_ENUM);
It seems inconsistent that the tag is lower-case, it is upper for all other
types (this is the name of the wrapper type).

Also nit: line length

[bbudge, 2015-06-25 11:59:06]

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[bbudge, 2015-06-25 11:59:22]

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[bbudge, 2015-06-26 01:20:31]

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[bbudge, 2015-06-26 01:20:40]

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