Runs fibonacci for all integer types.
Fold addressing arithmetic into stores.

Updates #16010.

Change-Id: I257982c82c00c80b00679757c3da345045968022
Reviewed-on: https://go-review.googlesource.com/25103Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: David Chase <drchase@google.com>