Fix length prop tests for the TypedArrays ctors family (#1479)

test/built-ins/ArrayBuffer/length.js

test/built-ins/DataView/length.js

test/built-ins/SharedArrayBuffer/length.js

test/built-ins/TypedArray/invoked.js

test/built-ins/TypedArray/length.js

test/built-ins/TypedArray/name.js

test/built-ins/TypedArray/prototype.js

test/built-ins/TypedArrays/BigInt64Array/length.js

test/built-ins/TypedArrays/BigUint64Array/length.js

test/built-ins/TypedArrays/Float32Array/length.js

test/built-ins/TypedArrays/Float64Array/length.js

test/built-ins/TypedArrays/Int16Array/length.js

test/built-ins/TypedArrays/Int32Array/length.js

test/built-ins/TypedArrays/Int8Array/length.js

test/built-ins/TypedArrays/Uint16Array/length.js

test/built-ins/TypedArrays/Uint32Array/length.js

test/built-ins/TypedArrays/Uint8Array/length.js

test/built-ins/TypedArrays/Uint8ClampedArray/length.js