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[vm] Add vsshr_4s to the arm64 assembler

TEST=vm/cc/Assembler_Sshr4S

Bug: #41950
Issue: #64170
Change-Id: I03ed2cd024c1727b750d1c799af370cb12ff510f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/542342
Auto-Submit: Modestas Valauskas <valauskasmodestas@gmail.com>
Reviewed-by: Slava Egorov <vegorov@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Slava Egorov <vegorov@google.com>
M
Modestas Valauskas committed
6ecea5d55ed2a5b914af051e9ae31045ebd2b59d
Parent: 9634f6b
Committed by dart-scoped@luci-project-accounts.iam.gserviceaccount.com <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> on 9/2/2026, 12:26:27 PM