x86: use symname also for IP-relative arguments

Change-Id: Ic291e8b284290f29dd586415a873fbf90bafcac9
Reviewed-on: https://go-review.googlesource.com/45099
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
4 files changed