The plan9 instructions ASLLV and -ASLLV are translated into the same assembly
instructions, so -ASLLV can be removed and replaced with ASLLV in the
corresponding position.
ASRLV and -ASRLV have the same reason as the above two instructions.
Change-Id: I4bd79ca7bb070f7a924a0205ef2f19cf2b9ae2c9
Reviewed-on: https://go-review.googlesource.com/c/go/+/565623 Reviewed-by: abner chenc <chenguoqi@loongson.cn> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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