[Dot Shorthands] Angular compiler support

[kallentu]

This issue tracks any work needed for the Angular compiler to support dot shorthands.

From context that @leonsenft provided, although dot shorthands will create new AST nodes, they won't work properly because no context can be provided to resolve the dot shorthand.

So something like <some-cmp [intProp]=".parse(stringExpr) /> won't work.

We'll prohibit the dot shorthands pattern in templates for now, and this will automatically be the case when the AST nodes for dot shorthands get added.

TLDR;; No work needed.
Will re-open if that's not the case anymore.