[vm/aot/tfa] Refactor hash codes in TFA This change removes code duplication around hash code calculations in TFA. TFA cannot use Object.hash from core library as it is not guaranteed to be stable across different runs but compiler should be deterministic. TEST=ci Change-Id: Id1b35974e89e82218d82957495c27b6aad099c86 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/330046 Reviewed-by: Martin Kustermann <kustermann@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>
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