cmd/compile: add tests for too-large shift amounts

cmd/compile: add tests for too-large shift amounts

Update #72018

Change-Id: I3188019658c37da3c31f06472023b39e13170ebf
Reviewed-on: https://go-review.googlesource.com/c/go/+/654316
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Junyang Shao <shaojunyang@google.com>
Reviewed-by: Keith Randall <khr@google.com>