Implement TypeParameterElementForLink.location.

Implement TypeParameterElementForLink.location.

This is needed because when comparing function types for equality, we
sometimes substitute in a fresh TypeParameterTypeImpl (see
FunctionTypeImpl.operator==()).  This means that we will sometimes be
doing equality comparisons between TypeParameterTypeImpl and
TypeParameterElementForLink.  TypeParameterTypeImpl.operator==() uses
Element.location to do the comparison.

R=brianwilkerson@google.com, scheglov@google.com

Committed: https://github.com/dart-lang/sdk/commit/eb6a8fda627ca9b22ca61c13a768ea3b41ed5396

[Paul Berry, 2016-04-15 15:44:49]

paulberry@google.com changed reviewers:
+ brianwilkerson@google.com, scheglov@google.com

[scheglov, 2016-04-15 15:47:40]

LGTM

[Brian Wilkerson, 2016-04-15 15:47:40]

lgtm

[Paul Berry, 2016-04-15 15:51:32]

Description was changed from

==========
Implement TypeParameterElementForLink.location.

This is needed because when comparing function types for equality, we
sometimes substitute in a fresh TypeParameterTypeImpl (see
FunctionTypeImpl.operator==()).  This means that we will sometimes be
doing equality comparisons between TypeParameterTypeImpl and
TypeParameterElementForLink.  TypeParameterTypeImpl.operator==() uses
Element.location to do the comparison.
==========

to

==========
Implement TypeParameterElementForLink.location.

This is needed because when comparing function types for equality, we
sometimes substitute in a fresh TypeParameterTypeImpl (see
FunctionTypeImpl.operator==()).  This means that we will sometimes be
doing equality comparisons between TypeParameterTypeImpl and
TypeParameterElementForLink.  TypeParameterTypeImpl.operator==() uses
Element.location to do the comparison.

R=brianwilkerson@google.com, scheglov@google.com

Committed:
https://github.com/dart-lang/sdk/commit/eb6a8fda627ca9b22ca61c13a768ea3b41ed5396
==========

[Paul Berry, 2016-04-15 15:51:33]

Committed patchset #1 (id:1) manually as
eb6a8fda627ca9b22ca61c13a768ea3b41ed5396 (presubmit successful).