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These instructions will soon be used for for smaller (32 bit) Smis. Also fix broken ubfiz instruction in ARM64 assembler. R=kustermann@google.com Change-Id: I9068a1c4281047dbd7c1c447fc32ac0e92c89e9d Reviewed-on: https://dart-review.googlesource.com/43668 Reviewed-by: Martin Kustermann <kustermann@google.com> Reviewed-by: Vyacheslav Egorov <vegorov@google.com>