Remove the Kernel setup_builtin_library transformation

Remove the Kernel setup_builtin_library transformation

This transformation replaces the body of _getMainClosure in
dart:_builtin with `return main` for the script's main if there is one
and removes the body if there is no main.

Without this transformation fasta will compile `return null` and dartk
will compile `return throw new NoSuchMethodError...`.  Both of these
patterns will be patched in the VM when dart:_builtin is compiled from
Kernel.

BUG=
R=sigmund@google.com

Committed: https://github.com/dart-lang/sdk/commit/04f7ba272a65a3ea0e170b53c68e200deda959db

[Kevin Millikin (Google), 2017-05-04 18:28:06]

kmillikin@google.com changed reviewers:
+ sigmund@google.com

[Kevin Millikin (Google), 2017-05-04 18:28:07]

The link-time transformation is still used by dartk for the Flutter target. 
I'll figure out if that's still needed and how to work around it as a separate
CL.

[Siggi Cherem (dart-lang), 2017-05-04 18:28:56]

lgtm, yay!

[Kevin Millikin (Google), 2017-05-04 18:29:50]

Description was changed from

==========
Remove the Kernel setup_builtin_library transformation

This transformation replaces the body of _getMainClosure in
dart:_builtin with `return main` for the script's main if there is one
and removes the body if there is no main.

Without this transformation fasta will compile `return null` and dartk
will compile `return throw new NoSuchMethodError...`.  Both of these
patterns will be patched in the VM when dart:_builtin is compiled from
Kernel.

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

to

==========
Remove the Kernel setup_builtin_library transformation

This transformation replaces the body of _getMainClosure in
dart:_builtin with `return main` for the script's main if there is one
and removes the body if there is no main.

Without this transformation fasta will compile `return null` and dartk
will compile `return throw new NoSuchMethodError...`.  Both of these
patterns will be patched in the VM when dart:_builtin is compiled from
Kernel.

BUG=
R=sigmund@google.com

Committed:
https://github.com/dart-lang/sdk/commit/04f7ba272a65a3ea0e170b53c68e200deda959db
==========

[Kevin Millikin (Google), 2017-05-04 18:29:52]

Committed patchset #1 (id:1) manually as
04f7ba272a65a3ea0e170b53c68e200deda959db (presubmit successful).