[dev.simd] cmd/compile: adjust param order for AndNot

[dev.simd] cmd/compile: adjust param order for AndNot

This CL adjusts the parameter order of AndNot, making it x &^ y instead
of ^x & y.

This CL also added a test.

This CL is partially generated by CL 687977.

Change-Id: I244e7b887991dc97e695131a5287af1b0e6fc3ce
Reviewed-on: https://go-review.googlesource.com/c/go/+/687996
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>