Merge pull request #926 from littledan/typedarray-constructor-edge-case

* Tests for throwing a TypeError in the TypedArray constructor on a detached buffer

Detached buffer causes an exception
- If it's already detached going into the constructor
- If the byteOffset coercion causes it to be detached

Tests are valid in ES2017

* Test that TypedArray constructor throws when detaching buffer in length calculation

This test is only valid with the PR in https://github.com/tc39/ecma262/pull/852

* Rename files per review