Further extend TypedArray support in d8:

test/mjsunit/regress/regress-1563.js

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 // Flags: --allow-natives-syntax
 
-obj = new PixelArray(10);
+obj = new Uint8ClampedArray(10);
 
 // Test that undefined gets properly clamped in Crankshafted pixel array
 // assignments.
 function set_pixel(obj, arg) {
   obj[0] = arg;
 }
 
 set_pixel(obj, 1.5);
 set_pixel(obj, NaN);
 %OptimizeFunctionOnNextCall(set_pixel);
 set_pixel(obj, undefined);
 set_pixel(obj, undefined);
 
 assertEquals(0, obj[0]);