test: add another test for issue 32680

Update #32680

Change-Id: I0318c22c22c5cd6ab6441d1aa2d1a40d20d71242
Reviewed-on: https://go-review.googlesource.com/c/go/+/185137
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: David Chase <drchase@google.com>

test/fixedbugs/issue32680b.go

+// compile
+
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+func hashBytesRaw(b0, b1, b2, b3, b7 byte) uint64 {
+	return (uint64(b0) | uint64(b1)<<8 | uint64(b2)<<16 | uint64(b3)<<24)
+}
+
+func doStuff(data []byte) uint64 {
+	return hashBytesRaw(data[0], data[1], data[2], data[3], data[7])
+
+}