API: expose getTypeOfArrayLiteralOrObjectLiteralDestructuringAssignment

[ajafff]

I'd like to be able to inspect the type of a destructuring assignment. Currently there is only getPropertySymbolOfDestructuringAssignment which only works with identifiers and only gets the symbol of one property. I need the whole destructured type.

A custom implementation would need to duplicate a lot code to correctly handle iteration protocol.

[RyanCavanaugh]

@rbuckton @ahejlsberg any objections?

[rbuckton]

Perhaps we should expose it with a name that is less of a mouthful? Something like getTypeOfDestructuringAssignment or getTypeOfAssignmentPattern.