Restrict backend misuse

Restrict backend misuse

BUG=
R=sigurdm@google.com

Committed: https://github.com/dart-lang/sdk/commit/ac122ffe921aa27f1f33571c5b0ef3a24f68bfa1

[Johnni Winther, 2015-11-25 13:30:38]

johnniwinther@google.com changed reviewers:
+ sigurdm@google.com

[Johnni Winther, 2015-11-25 13:30:39]

https://codereview.chromium.org/1469353004/diff/1/pkg/compiler/lib/src/js_bac...
File pkg/compiler/lib/src/js_backend/backend.dart (right):

https://codereview.chromium.org/1469353004/diff/1/pkg/compiler/lib/src/js_bac...
pkg/compiler/lib/src/js_backend/backend.dart:584: /// The backend must *always*
call this method when enqueuing an
Moved from line 1482 and extended with assertions.

[sigurdm, 2015-11-25 13:41:51]

LGTM

[Johnni Winther, 2015-11-25 14:49:51]

Committed patchset #2 (id:20001) manually as
ac122ffe921aa27f1f33571c5b0ef3a24f68bfa1 (presubmit successful).

[sra1, 2015-11-25 19:02:13]

sra@google.com changed reviewers:
+ sra@google.com

[sra1, 2015-11-25 19:02:13]

https://codereview.chromium.org/1469353004/diff/20001/pkg/compiler/lib/src/js...
File pkg/compiler/lib/src/js_backend/backend_helpers.dart (right):

https://codereview.chromium.org/1469353004/diff/20001/pkg/compiler/lib/src/js...
pkg/compiler/lib/src/js_backend/backend_helpers.dart:696: }
FYI this can be written

MethodElement get objectNoSuchMethod =>
    _objectNoSuchMethod ??=
        coreClasses.objectClass.lookupLocalMember(Identifiers.noSuchMethod_);