cmd/compile: do not reuse dead value in expand_calls pass

We reuse a value for the same selector on the same arg. But if the
value is already marked dead, don't reuse it. A use of an
OpInvalid will confuse the compiler.

Fixes #48916.

Change-Id: I15b9e15b49f6e1991fe91df246cd12a193385e85
Reviewed-on: https://go-review.googlesource.com/c/go/+/355409


Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Go Bot <gobot@golang.org>