tree 325bf67ba8680912c335368b7bbd8349ae7cafed
parent 28c78b9d4673344067ed8506c2f9e533a677a74b
author Aart Bik <ajcbik@google.com> 1544740728 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org> 1544740728 +0000

[vm/compiler] avoid literal null is non-nullable

Rationale:
Having a literal null checked by CheckNull with
a subsequent Redefinition resulted in some strange
unboxing that crashed AOT (fix courtesy Slava!).
Note that we still have some ambiguity around
adding/removing environments from instructions
that may deoptimize, but this change fixes all
prior related DartFuzz failures.

https://github.com/dart-lang/sdk/issues/35335

Change-Id: Ifb50d8cddf93e57758b2bbb83ad397ea281e9307
Reviewed-on: https://dart-review.googlesource.com/c/87280
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Commit-Queue: Aart Bik <ajcbik@google.com>