Merge pull request #448 from anba/arraybuffer_coverage

test/built-ins/ArrayBuffer/allocation-limit.js

...-ins/ArrayBuffer/data-allocation-after-object-creation.js

test/built-ins/ArrayBuffer/length-is-absent.js

test/built-ins/ArrayBuffer/length-is-not-number.js

...uilt-ins/ArrayBuffer/newtarget-prototype-is-not-object.js

test/built-ins/ArrayBuffer/number-conversion.js

test/built-ins/ArrayBuffer/positive-integer-length.js

test/built-ins/ArrayBuffer/prototype-from-newtarget.js

test/built-ins/ArrayBuffer/prototype/constructor.js

...ffer/prototype/slice/context-is-not-arraybuffer-object.js

...-ins/ArrayBuffer/prototype/slice/context-is-not-object.js

test/built-ins/ArrayBuffer/prototype/slice/descriptor.js

...-ins/ArrayBuffer/prototype/slice/end-default-if-absent.js

...s/ArrayBuffer/prototype/slice/end-default-if-undefined.js

...ilt-ins/ArrayBuffer/prototype/slice/end-exceeds-length.js

test/built-ins/ArrayBuffer/prototype/slice/extensible.js

test/built-ins/ArrayBuffer/prototype/slice/length.js

test/built-ins/ArrayBuffer/prototype/slice/name.js

test/built-ins/ArrayBuffer/prototype/slice/negative-end.js

test/built-ins/ArrayBuffer/prototype/slice/negative-start.js