cmd/compile: reorder rotate lowering rules in AMD64.rules
cmd/compile: reorder rotate lowering rules in AMD64.rules

These rules should belong to lowering rules not optimizations.

Change-Id: I964d2c4b1d9bef0ede572978aff01cb11bf050ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/426197
Reviewed-by: Keith Randall <8c99c3a9284e493be632950b84cd789d08ed3e9d@google.com>
Reviewed-by: Heschi Kreinick <e89ab2b172855aa0ad01c40c4d8a3535a61ac68a@google.com>
Reviewed-by: Keith Randall <8c99c3a9284e493be632950b84cd789d08ed3e9d@golang.org>
Auto-Submit: Keith Randall <8c99c3a9284e493be632950b84cd789d08ed3e9d@golang.org>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Run-TryBot: Wayne Zuo <80a2851bf00137386671727038f63ec48a4d19a1@golangcn.org>

golang/go,golang/go,golang/go,golang/go,golang/go,golang/go,golang/go,golang/go