Re-land of CL 2990703002, adding fixes to analyzer_test and error_test.

Re-land of CL 2990703002, adding fixes to analyzer_test and error_test.

This CL is identical to the reverted CL 2990703002 which implements
syntactic support for generalized void in the analyzer, plus two bug
fixes in pkg/analyzer/test/generated/parser_test.dart and
pkg/analyzer_cli/test/error_test.dart. In the former, a test on parsing
`void,` was changed to expect an error: _isTypeIdentifier on a lone
`void` will no longer return true, which is necessary because `void`
can now be used as a type annotation alone. Another test on `void x`
was added, which produces the behavior previously seen for `void,`.
In error_test, the error which is used throughout was changed from
`void foo;` to `var int foo;` (because the former is no longer an
error).

Committed: https://github.com/dart-lang/sdk/commit/9336e199fd7360ee229de5b4ebef5940aab266ec

[eernst, 2017-07-27 10:36:59]

eernst@google.com changed reviewers:
+ brianwilkerson@google.com

[eernst, 2017-07-27 10:37:00]

TBR, only adjusts two tests compared to the CL landed yesterday.

[eernst, 2017-07-27 10:39:24]

Description was changed from

==========
Re-land of CL 2990703002, adding fixes to analyzer_test and error_test.

This CL is identical to the reverted CL 2990703002 which implements
syntactic support for generalized void in the analyzer, plus two bug
fixes in pkg/analyzer/test/generated/parser_test.dart and
pkg/analyzer_cli/test/error_test.dart. In the former, a test on parsing
`void,` was changed to expect an error: _isTypeIdentifier on a lone
`void` will no longer return true, which is necessary because `void`
can now be used as a type annotation alone. Another test on `void x`
was added, which produces the behavior previously seen for `void,`.
In error_test, the error which is used throughout was changed from
`void foo;` to `var int foo;` (because the former is no longer an
error).
==========

to

==========
Re-land of CL 2990703002, adding fixes to analyzer_test and error_test.

This CL is identical to the reverted CL 2990703002 which implements
syntactic support for generalized void in the analyzer, plus two bug
fixes in pkg/analyzer/test/generated/parser_test.dart and
pkg/analyzer_cli/test/error_test.dart. In the former, a test on parsing
`void,` was changed to expect an error: _isTypeIdentifier on a lone
`void` will no longer return true, which is necessary because `void`
can now be used as a type annotation alone. Another test on `void x`
was added, which produces the behavior previously seen for `void,`.
In error_test, the error which is used throughout was changed from
`void foo;` to `var int foo;` (because the former is no longer an
error).

Committed:
https://github.com/dart-lang/sdk/commit/9336e199fd7360ee229de5b4ebef5940aab266ec
==========

[eernst, 2017-07-27 10:39:25]

Committed patchset #1 (id:1) manually as
9336e199fd7360ee229de5b4ebef5940aab266ec (presubmit successful).