[immutable-arraybuffer] Coverage for mutating TypedArray methods

[gibson042]

Ref #4509

%TypedArray%.prototype properties

• %TypedArray%.prototype.{copyWithin,fill,reverse,set}

  • throws a TypeError if the receiver is backed by an immutable ArrayBuffer, before touching any argument
  • ...even if the targeted range is of length 0

• %TypedArray%.prototype.sort

  • throws a TypeError if the receiver is backed by an immutable ArrayBuffer, after validating that comparator is callable (note the unusual receiver-after-argument order)
  • ...even if the receiver is of length 0

• Uint8Array.prototype.{setFromBase64,setFromHex}

  • throws a TypeError if the receiver is backed by an immutable ArrayBuffer, before touching any argument

[ptomato]

Minor comments, feel free to merge when addressed.

[ptomato]

There aren't any arguments to read, or any reentrancy into user code at all for that matter, so this is a bit overkill. Maybe delete calls and its assertion?