Fix error recovery for extracting native name.

Fix error recovery for extracting native name.

I discovered this now that native is
enabled more widely (see bot failures here:
https://build.chromium.org/p/client.dart/builders/vm-kernel-linux-release-x64-be/builds/2731/steps/vm%20tests/logs/stdio)

Here is an example input that hit the problem:

  K() sync* {}; // //# 50: compile-time error


TBR=ahe@google.com

Committed: https://github.com/dart-lang/sdk/commit/2046d08c097d1f12eccdd97320c422f26f38977c

[Siggi Cherem (dart-lang), 2017-05-31 23:13:48]

Description was changed from

==========
Fix error recovery for extracting native name.

IIUC, the old behavior was not robust. I discovered this now that native is
enabled more widely (see bot failures here:
https://build.chromium.org/p/client.dart/builders/vm-kernel-linux-release-x64...)

Here is an example input that hit the problem:

  K() sync* {}; // //# 50: compile-time error

TBR=ahe@google.com
==========

to

==========
Fix error recovery for extracting native name.

I discovered this now that native is
enabled more widely (see bot failures here:
https://build.chromium.org/p/client.dart/builders/vm-kernel-linux-release-x64...)

Here is an example input that hit the problem:

  K() sync* {}; // //# 50: compile-time error


TBR=ahe@google.com
==========

[Siggi Cherem (dart-lang), 2017-05-31 23:17:23]

Description was changed from

==========
Fix error recovery for extracting native name.

I discovered this now that native is
enabled more widely (see bot failures here:
https://build.chromium.org/p/client.dart/builders/vm-kernel-linux-release-x64...)

Here is an example input that hit the problem:

  K() sync* {}; // //# 50: compile-time error


TBR=ahe@google.com
==========

to

==========
Fix error recovery for extracting native name.

I discovered this now that native is
enabled more widely (see bot failures here:
https://build.chromium.org/p/client.dart/builders/vm-kernel-linux-release-x64...)

Here is an example input that hit the problem:

  K() sync* {}; // //# 50: compile-time error


TBR=ahe@google.com

Committed:
https://github.com/dart-lang/sdk/commit/2046d08c097d1f12eccdd97320c422f26f38977c
==========

[Siggi Cherem (dart-lang), 2017-05-31 23:17:25]

Committed patchset #1 (id:1) manually as
2046d08c097d1f12eccdd97320c422f26f38977c (presubmit successful).

[ahe, 2017-06-01 13:56:25]

lgtm