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It is probably not worth trying to unify LoadInt64FromBoxOrSmi for the 32 bit targets. The function would need two out registers, and is currently integrated inside `UnboxInstr::EmitLoadFromBox`. TEST=vm/cc/Assembler_LoadInt64 Change-Id: Ie49849889ee6ec7804c48696ed3202e08ef7373b Cq-Include-Trybots: luci.dart.try:vm-linux-debug-ia32-try,vm-linux-debug-x64-try,vm-linux-debug-x64c-try,vm-linux-release-simarm-try,vm-linux-release-simarm64-try,vm-linux-debug-simriscv64-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/328522 Reviewed-by: Tess Strickland <sstrickl@google.com> Commit-Queue: Daco Harkes <dacoharkes@google.com>