Expose SIMD.Float32x4 type to Javascript.

test/mjsunit/object-toprimitive.js

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+// Flags: --harmony-simd
+
 // Test the ToPrimitive internal function used by ToNumber/ToString.
 // Does it [[Get]] and [[Call]] the object's toString and valueOf properties
 // correctly. Specifically, does it call [[Get]] only once per property.
 
 var o1 = { toString: function() { return 42; },
            valueOf: function() { return "37"; } };
 var n1 = Number(o1);
 var s1 = String(o1);
 assertTrue(typeof n1 == "number");
 assertTrue(typeof s1 == "string");
@@ skipping 59 matching lines @@
 assertEquals(["gts", "gvo"], trace);
 
 toStringFunc = traceToString;
 toStringValue = "87";
 trace = [];
 var nt = Number(ot);
 assertEquals(87, nt);
 assertEquals(["gvo", "gts", "ts"], trace);
 
 assertThrows('Number(Symbol())', TypeError);
+
+assertThrows('Number(SIMD.float32x4(1, 2, 3, 4))', TypeError);

[bbudge, 2015/07/13 23:10:39]

I'll just delete this test - it's covered by TestToNumber in
tests/mjsunit/harmony/simd.js.