Move tests for iterator prototype methods

...eratorPrototype/Symbol.toStringTag/property-descriptor.js

...ArrayIteratorPrototype/Symbol.toStringTag/value-direct.js

...ratorPrototype/Symbol.toStringTag/value-from-to-string.js

test/built-ins/ArrayIteratorPrototype/next/Float32Array.js

test/built-ins/ArrayIteratorPrototype/next/Float64Array.js

test/built-ins/ArrayIteratorPrototype/next/Int16Array.js

test/built-ins/ArrayIteratorPrototype/next/Int32Array.js

test/built-ins/ArrayIteratorPrototype/next/Int8Array.js

test/built-ins/ArrayIteratorPrototype/next/Uint16Array.js

test/built-ins/ArrayIteratorPrototype/next/Uint32Array.js

test/built-ins/ArrayIteratorPrototype/next/Uint8Array.js

...uilt-ins/ArrayIteratorPrototype/next/Uint8ClampedArray.js

...rPrototype/next/args-mapped-expansion-after-exhaustion.js

...Prototype/next/args-mapped-expansion-before-exhaustion.js

...-ins/ArrayIteratorPrototype/next/args-mapped-iteration.js

...rototype/next/args-mapped-truncation-before-exhaustion.js

...rototype/next/args-unmapped-expansion-after-exhaustion.js

...ototype/next/args-unmapped-expansion-before-exhaustion.js

...ns/ArrayIteratorPrototype/next/args-unmapped-iteration.js

...totype/next/args-unmapped-truncation-before-exhaustion.js