Initializers of late local variables are wrapped into closures.
The result type of a closure is a static type of the variable.
So initializer of a late variable with static type Never have a call
to a closure with static result type Never.
TFA summary collector handles calls with static result type Never
specially, treating all subsequent code as unreachable (by setting
control-dependent condition to empty). As a result, all subsequent
code after late variable with static type Never (and initializer) is
tree-shaken.
The fix is to avoid propagating control-dependent condition out of
the late variable initializers.
TEST=pkg/vm/testcases/transformations/type_flow/transformer/regress_63478.dart
Fixes https://github.com/dart-lang/sdk/issues/63478
Change-Id: If41221777c9d249dd21ce5827c586b0f531cbce8
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/508363
Reviewed-by: Slava Egorov <vegorov@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Alexander Markov
7ff5e3654d