Add cleanup ShrinkingReducer pass after second TypePropagation pass.

Add cleanup ShrinkingReducer pass after second TypePropagation pass.

The need for cleanup shows up in
co19/LibTest/collection/DoubleLinkedQueue/forEachEntry_A01_t02

The compiler crashed: Internal Error: Unreachable continuations must be removed before computing loop side effects.


TBR=asgerf@google.com

Committed: https://github.com/dart-lang/sdk/commit/1aab83e6dd9b2b03f2157beab4a2276e8fd9f321

[sra1, 2016-01-14 05:49:05]

Patchset #1 (id:1) has been deleted

[sra1, 2016-01-14 05:50:28]

Description was changed from

==========
Add cleanup ShrinkingReducer pass after second TypePropagation pass.

The need for cleanup shows up in
co19/LibTest/collection/DoubleLinkedQueue/forEachEntry_A01_t02

The compiler crashed: Internal Error: Unreachable continuations must be removed
before computing loop side effects.


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

to

==========
Add cleanup ShrinkingReducer pass after second TypePropagation pass.

The need for cleanup shows up in
co19/LibTest/collection/DoubleLinkedQueue/forEachEntry_A01_t02

The compiler crashed: Internal Error: Unreachable continuations must be removed
before computing loop side effects.


TBR=asgerf@google.com
==========

[sra1, 2016-01-14 05:50:28]

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

[sra1, 2016-01-14 06:10:56]

Description was changed from

==========
Add cleanup ShrinkingReducer pass after second TypePropagation pass.

The need for cleanup shows up in
co19/LibTest/collection/DoubleLinkedQueue/forEachEntry_A01_t02

The compiler crashed: Internal Error: Unreachable continuations must be removed
before computing loop side effects.


TBR=asgerf@google.com
==========

to

==========
Add cleanup ShrinkingReducer pass after second TypePropagation pass.

The need for cleanup shows up in
co19/LibTest/collection/DoubleLinkedQueue/forEachEntry_A01_t02

The compiler crashed: Internal Error: Unreachable continuations must be removed
before computing loop side effects.


TBR=asgerf@google.com

Committed:
https://github.com/dart-lang/sdk/commit/1aab83e6dd9b2b03f2157beab4a2276e8fd9f321
==========

[sra1, 2016-01-14 06:10:57]

Committed patchset #1 (id:20001) manually as
1aab83e6dd9b2b03f2157beab4a2276e8fd9f321 (presubmit successful).

[sra1, 2016-01-14 16:29:54]

FYI The second TypePropagation pass inlined a single-use closure that had a body
that always throws. The return continuation became unreachable.

[asgerf, 2016-01-14 18:06:53]

LGTM.