[vm/dbc] Support unboxed Int64 on DBC Note that this CL only implements the Box and Unbox instructions for 64 bit ints, but does not implement unboxed 64 bit int arithmetic. Change-Id: I6205a900493ce526ef59d3e1f9c4887cae4d1f21 Cq-Include-Trybots: luci.dart.try:vm-kernel-linux-debug-simdbc64-try, vm-kernel-linux-release-simdbc64-try, vm-kernel-mac-debug-simdbc64-try, vm-kernel-mac-release-simdbc64-try, vm-kernel-reload-mac-debug-simdbc64-try, vm-kernel-reload-mac-release-simdbc64-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/99025 Commit-Queue: Daco Harkes <dacoharkes@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>
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