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R=rmacnak@google.com Also some minor cleanup in the way we encode ARM instructions. I'll be needing these for 32 bit Smis on ARM64. Bug: Change-Id: I5f515590375a2c6ad11bc6f1a80a4f8e27cd82b4 Reviewed-on: https://dart-review.googlesource.com/20668 Commit-Queue: Erik Corry <erikcorry@google.com> Reviewed-by: Ryan Macnak <rmacnak@google.com>