Object: Introduce set and setIndexed

These names are what the ES6 spec uses for this operation. We also
introduce a bool to allow throwing unconditionally if a set fails (which
the spec requires the Set operation to do in a number of places). This
requirement was also present in ES5, but we ignored it, and thus far got
away with it.

Long term, put and putIndexed should go away, but I don't feel
comfortable porting everything over blindly, as some operations do
require throwing, namely:

* Various Array & TypedArray methods that alter 'length'
* Various RegExp methods that alter 'lastIndex'

This change also ports the new Object.assign to use the must-throw
version of set(), which coincidentally fixes the one test failure in
non-strict mode.

Change-Id: Ida641a552d805af0fd9de3333eb62cc6adb3713c
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

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