Implement parsing support for generic functions

Implement parsing support for generic functions

Take two. (This version adds status file entries for checked
tests.)

Type parameters and arguments are parsed but ignored. Proper
handling of the parameters will be added subsequently.

The feature must be enabled with --generic-method-syntax.


Compiling all of dart2js consumes about 2.2% more tokens with
this change, due to the necessary lookahead to distinguish
generic functions from generic types.


===== with this change =========

Number of tokens:        1056691
Source length:           5850143 characters
Number of source tokens: 936226

Total tokens consumed:   3628934  <<<<<
Classes parsed:          2457
  Tokens consumed:       977999
Functions parsed:        49607
  Tokens consumed:       2430638

===== without this change ======

Number of tokens:        1056691
Source length:           5850143 characters
Number of source tokens: 936226

Total tokens consumed:   3547765 <<<<<
Classes parsed:          2457
  Tokens consumed:       942536
Functions parsed:        49607
  Tokens consumed:       2371357


(This reverts commit a1edb1766fd16b1268f3506feb7c9856b32bedfc.)

BUG=25869
Committed: https://github.com/dart-lang/sdk/commit/4d4ebafad3f735b3d69360370b163f4e79d229ba

[hausner, 2016-08-22 16:23:06]

Description was changed from

==========
Implement parsing support for generic functions

Take two.

Type parameters and arguments are parsed but ignored. Proper
handling of the parameters will be added subsequently.

The feature must be enabled with --generic-method-syntax.


Compiling all of dart2js consumes about 2.2% more tokens with
this change, due to the necessary lookahead to distinguish
generic functions from generic types.


===== with this change =========

Number of tokens:        1056691
Source length:           5850143 characters
Number of source tokens: 936226

Total tokens consumed:   3628934  <<<<<
Classes parsed:          2457
  Tokens consumed:       977999
Functions parsed:        49607
  Tokens consumed:       2430638

===== without this change ======

Number of tokens:        1056691
Source length:           5850143 characters
Number of source tokens: 936226

Total tokens consumed:   3547765 <<<<<
Classes parsed:          2457
  Tokens consumed:       942536
Functions parsed:        49607
  Tokens consumed:       2371357


(This reverts commit a1edb1766fd16b1268f3506feb7c9856b32bedfc.)

BUG= 25869
==========

to

==========
Implement parsing support for generic functions

Take two. (This version adds status file entries for checked
tests.)

Type parameters and arguments are parsed but ignored. Proper
handling of the parameters will be added subsequently.

The feature must be enabled with --generic-method-syntax.


Compiling all of dart2js consumes about 2.2% more tokens with
this change, due to the necessary lookahead to distinguish
generic functions from generic types.


===== with this change =========

Number of tokens:        1056691
Source length:           5850143 characters
Number of source tokens: 936226

Total tokens consumed:   3628934  <<<<<
Classes parsed:          2457
  Tokens consumed:       977999
Functions parsed:        49607
  Tokens consumed:       2430638

===== without this change ======

Number of tokens:        1056691
Source length:           5850143 characters
Number of source tokens: 936226

Total tokens consumed:   3547765 <<<<<
Classes parsed:          2457
  Tokens consumed:       942536
Functions parsed:        49607
  Tokens consumed:       2371357


(This reverts commit a1edb1766fd16b1268f3506feb7c9856b32bedfc.)

BUG= 25869
==========

[hausner, 2016-08-22 16:23:07]

hausner@google.com changed reviewers:
+ asiva@google.com

[hausner, 2016-08-22 17:58:59]

Description was changed from

==========
Implement parsing support for generic functions

Take two. (This version adds status file entries for checked
tests.)

Type parameters and arguments are parsed but ignored. Proper
handling of the parameters will be added subsequently.

The feature must be enabled with --generic-method-syntax.


Compiling all of dart2js consumes about 2.2% more tokens with
this change, due to the necessary lookahead to distinguish
generic functions from generic types.


===== with this change =========

Number of tokens:        1056691
Source length:           5850143 characters
Number of source tokens: 936226

Total tokens consumed:   3628934  <<<<<
Classes parsed:          2457
  Tokens consumed:       977999
Functions parsed:        49607
  Tokens consumed:       2430638

===== without this change ======

Number of tokens:        1056691
Source length:           5850143 characters
Number of source tokens: 936226

Total tokens consumed:   3547765 <<<<<
Classes parsed:          2457
  Tokens consumed:       942536
Functions parsed:        49607
  Tokens consumed:       2371357


(This reverts commit a1edb1766fd16b1268f3506feb7c9856b32bedfc.)

BUG= 25869
==========

to

==========
Implement parsing support for generic functions

Take two. (This version adds status file entries for checked
tests.)

Type parameters and arguments are parsed but ignored. Proper
handling of the parameters will be added subsequently.

The feature must be enabled with --generic-method-syntax.


Compiling all of dart2js consumes about 2.2% more tokens with
this change, due to the necessary lookahead to distinguish
generic functions from generic types.


===== with this change =========

Number of tokens:        1056691
Source length:           5850143 characters
Number of source tokens: 936226

Total tokens consumed:   3628934  <<<<<
Classes parsed:          2457
  Tokens consumed:       977999
Functions parsed:        49607
  Tokens consumed:       2430638

===== without this change ======

Number of tokens:        1056691
Source length:           5850143 characters
Number of source tokens: 936226

Total tokens consumed:   3547765 <<<<<
Classes parsed:          2457
  Tokens consumed:       942536
Functions parsed:        49607
  Tokens consumed:       2371357


(This reverts commit a1edb1766fd16b1268f3506feb7c9856b32bedfc.)

BUG= 25869

Committed:
https://github.com/dart-lang/sdk/commit/4d4ebafad3f735b3d69360370b163f4e79d229ba
==========

[hausner, 2016-08-22 17:59:00]

Committed patchset #1 (id:1) manually as
4d4ebafad3f735b3d69360370b163f4e79d229ba (presubmit successful).

[hausner, 2016-08-22 17:59:34]

TBR=asiva