cmd/asm, cmd/internal/obj/ppc64: increase asm test coverage for PPC64
This CL adds tests for some of the instructions that were
missing. A minor change was made to asm9.go to ensure EXTSWSLICC
test works.
Change-Id: I95cd096c85778fc93856d213aa4fb14c35228cec
Reviewed-on: https://go-review.googlesource.com/c/go/+/430376
Run-TryBot: Archana Ravindar <aravind5@in.ibm.com>
Reviewed-by: Jenny Rakoczy <jenny@golang.org>
Run-TryBot: Jenny Rakoczy <jenny@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Paul Murphy <murp@ibm.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Jenny Rakoczy <jenny@golang.org>