Fix field initialization order for forwarding constructors.

Fix evaluation field initialization order for forwarding constructors.

Intestingly, the VM, dart2js/SSA and dart2js/CPS all fail the new test
in three different ways.

This CL fixed the SSA and CPS backends, and leaves a status line for
the VM.

When a constructor A redirects to B, it is B that should evaluate
declaration-site initializers (unless B also redirects).
Thus, this should happen after the arguments to B have been computed.

In SSA: Fields were initialized at A instead of B
(i.e. before redirect).

In CPS: Fields were initialized at both places, just horrible.

In VM: There seems to be a problem with redirecting constructors
called using super().

VM bug report: https://code.google.com/p/dart/issues/detail?id=23488

BUG=
R=floitsch@google.com

Committed: https://github.com/dart-lang/sdk/commit/036f50d6aa4d19d422be49780eb60c6fb9c4f676

[asgerf, 2015-05-19 14:49:04]

asgerf@google.com changed reviewers:
+ floitsch@google.com

[floitsch, 2015-05-19 15:27:54]

LGTM!

https://codereview.chromium.org/1129693006/diff/1/tests/language/language.status
File tests/language/language.status (right):

https://codereview.chromium.org/1129693006/diff/1/tests/language/language.sta...
tests/language/language.status:32: redirecting_constructor_initializer_test:
RuntimeError
Add bug-number.

[asgerf, 2015-05-19 15:32:29]

https://codereview.chromium.org/1129693006/diff/1/tests/language/language.status
File tests/language/language.status (right):

https://codereview.chromium.org/1129693006/diff/1/tests/language/language.sta...
tests/language/language.status:32: redirecting_constructor_initializer_test:
RuntimeError
On 2015/05/19 15:27:54, floitsch wrote:
> Add bug-number.

Done.

[asgerf, 2015-05-19 15:53:00]

PTAL the test case revealed another bug in the builder

[floitsch, 2015-05-19 15:57:27]

Still LGTM.

[asgerf, 2015-05-20 08:05:59]

Committed patchset #4 (id:60001) manually as
036f50d6aa4d19d422be49780eb60c6fb9c4f676 (presubmit successful).