support tear-offs for constructors

[DartBot]

This issue was originally filed by bsles...@gmail.com

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It would be convenient to convert a constructor to a function:

class Foo {
  final int x;
  final int y;
  Foo.make(this.x, this.y);
}

final Function makeFoo = Foo.make;

main() {
  makeFoo(1, 2);
}

The result is:

NoSuchMethodError: method not found: 'get:make'
Receiver: Type: class 'Foo'
Arguments: [...]

­0 NoSuchMethodError._throwNew (dart:core-patch/errors_patch.dart:166)

­1 makeFoo (file:///Users/skybrian/dart/bugtest/bin/tearoff.dart:7:26)

­2 main (file:///Users/skybrian/dart/bugtest/bin/tearoff.dart:10:3)

­3 _startIsolate.isolateStartHandler (dart:isolate-patch/isolate_patch.dart:216)

­4 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:115)

Workaround 1: write a function that calls the constructor. However, this can be tedious if the constructor takes a large number of optional arguments.

Workaround 2: perhaps use noSuchMethod and ClassMirror.newInstance?

[dgrove]

Added Area-Language, Triaged labels.

[DartBot]

This comment was originally written by @seaneagan

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dupe of issue #10659

[gbracha]

Added Duplicate label.
Marked as being merged into #10659.