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This change propagates --enable-mirrors VM flag to CFE via TargetFlags.supportMirrors. CFE uses that to select conditional imports and for constant evaluation of bool.fromEnvironment. TEST=runtime/tests/vm/dart/enable_mirrors_test Issue: https://github.com/dart-lang/sdk/issues/49266 Change-Id: I9f6b03f1ab224d13cbe9f035fb5b6fa6eb59055c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/249020 Reviewed-by: Ben Konyi <bkonyi@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>