cmd/compile: use SLLW for Lsh32x(64|32|16|8) on riscv64 Use SLLW for left shift of 32 bit values on riscv64 - this potentially avoids the need to extend the input and/or output. Change-Id: I19dcf624af9ad8245c48e0810eec7a676a164f91 Reviewed-on: https://go-review.googlesource.com/c/go/+/748921 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Julian Zhu <jz531210@gmail.com> Reviewed-by: Cherry Mui <cherryyz@google.com>
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