dart2js: Do not eliminate calls whose receiver can be null.

dart2js: Do not eliminate calls whose receiver can be null.

In the CPS backend's type propagation, try to avoid eliminating calls
whose receiver can be null.

This fixes a bug in the constant folding of indexed access.  e0[e1]
would be folded away if e0 could be null but type inference told us
that the elements had a known (specifically null) type.

tests/language/inference_list_or_null_test triggers the bug.

R=asgerf@google.com
BUG=

Committed: https://github.com/dart-lang/sdk/commit/ff1c630edc06edad71cc70d068cce71cccfcb50b

[asgerf, 2015-12-10 11:58:10]

LGTM

[Kevin Millikin (Google), 2015-12-10 12:02:57]

Description was changed from

==========
dart2js: Do not eliminate calls whose receiver can be null.

In the CPS backend's type propagation, try to avoid eliminating calls
whose receiver can be null.

This fixes a bug in the constant folding of indexed access.  e0[e1]
would be folded away if e0 could be null but type inference told us
that the elements had a known (specifically null) type.

tests/language/inference_list_or_null_test triggers the bug.

R=asgerf@google.com
BUG=
==========

to

==========
dart2js: Do not eliminate calls whose receiver can be null.

In the CPS backend's type propagation, try to avoid eliminating calls
whose receiver can be null.

This fixes a bug in the constant folding of indexed access.  e0[e1]
would be folded away if e0 could be null but type inference told us
that the elements had a known (specifically null) type.

tests/language/inference_list_or_null_test triggers the bug.

R=asgerf@google.com
BUG=

Committed:
https://github.com/dart-lang/sdk/commit/ff1c630edc06edad71cc70d068cce71cccfcb50b
==========

[Kevin Millikin (Google), 2015-12-10 12:02:58]

Committed patchset #1 (id:1) manually as
ff1c630edc06edad71cc70d068cce71cccfcb50b (presubmit successful).

[sra1, 2015-12-10 17:03:50]

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

[sra1, 2015-12-10 17:03:51]

Thanks!