Chuck Jazdzewski 82bcd83566 feat(compiler): allow ngIf to use the ngIf expression directly as a guard
Allows a directive to use the expression passed directly to a property
as a guard instead of filtering the type through a type expression.

This more accurately matches the intent of the ngIf usage of its template
enabling better type inference.

Moved NgIf to using this type of guard instead of a function guard.

Closes: #20967
2017-12-18 12:09:21 -08:00
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