dart2js CPS: Remove an invalid assertion in shrinking reductions.

dart2js CPS: Remove an invalid assertion in shrinking reductions.

Because we search for new redexes while performing reductions, we can't
always assert that a term is well-formed.

In this case, it's not true that all invocations of a continuation will have
the same number of arguments while we are in the middle of performing a dead
parameter reduction.

BUG=
R=asgerf@google.com

Committed: https://github.com/dart-lang/sdk/commit/b76ffa9505f1a282cb5c83a1d769925c2aa3c3c2

[Kevin Millikin (Google), 2016-01-28 11:49:45]

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

[asgerf, 2016-01-28 11:54:42]

lgtm

[Kevin Millikin (Google), 2016-01-28 11:56:12]

Description was changed from

==========
dart2js CPS: Remove an invalid assertion in shrinking reductions.

Because we search for new redexes while performing reductions, we can't
always assert that a term is well-formed.

In this case, it's not true that all invocations of a continuation will have
the same number of arguments while we are in the middle of performing a dead
parameter reduction.

BUG=
==========

to

==========
dart2js CPS: Remove an invalid assertion in shrinking reductions.

Because we search for new redexes while performing reductions, we can't
always assert that a term is well-formed.

In this case, it's not true that all invocations of a continuation will have
the same number of arguments while we are in the middle of performing a dead
parameter reduction.

BUG=
R=asgerf@google.com

Committed:
https://github.com/dart-lang/sdk/commit/b76ffa9505f1a282cb5c83a1d769925c2aa3c3c2
==========

[Kevin Millikin (Google), 2016-01-28 11:56:14]

Committed patchset #1 (id:1) manually as
b76ffa9505f1a282cb5c83a1d769925c2aa3c3c2 (presubmit successful).