[vm/aot/tfa] Fix handling of 'assert' statement With conditional data flow TFA should model control flow in 'assert' statements more precisely: message expression is not always executed; variable values and condition should not be propagated down from message expression. TEST=language/assert/message_test Fixes https://github.com/dart-lang/sdk/issues/52503 Change-Id: Iea3b0bae38ab328bd1ad92cacc6b4c3c99f9753f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/305342 Commit-Queue: Alexander Markov <alexmarkov@google.com> Reviewed-by: Slava Egorov <vegorov@google.com>
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