This updates master to fix the ppc64 objdump. There were many cases where
the Go objdump was generating opcodes that didn't exist in the Go assembler,
or generated operands in the wrong order. The goal is to generate a Go
objdump that is acceptable to the Go assembler, or as close as possible.

An additional change will be needed for the Go objdump tool to make
use of this.

Change-Id: Ie8d2d534e13b9a64852c99b4b864a9c08ed7e036
Reviewed-on: https://go-review.googlesource.com/c/152517Reviewed-by: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>