[dev.simd] cmd/compile: glue codes for Shift and Rotate
This CL adds two more intrinsic lowering functions. They can issue an
OpCopy to move a scalar value to vector value. This is needed by Shift
and Rotate APIs.
Change-Id: I8a83197d33207072c4a9221a931e67dddd5cd0bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/683476
Auto-Submit: Junyang Shao <shaojunyang@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Cherry Mui <cherryyz@google.com>