tree ed2ab1a9ada76330532828828b055f30a4d96985
parent d29ec40e19fa0548292bb0bf2a4fb88920838877
author Michael Munday <mike.munday@ibm.com> 1525103713 +0100
committer Michael Munday <mike.munday@ibm.com> 1525189697 +0000

cmd/compile: allow R11 to be allocated on s390x

R11 is only used as a temporary by a very small set of instructions
(DIV, MOD, MULH and extended MVC/XC instructions). By marking these
instructions as clobbering R11 we can allocate R11 in the general
case.

Change-Id: I0d4ffe80e57c164d42a5ea5ef6308756a5b0f742
Reviewed-on: https://go-review.googlesource.com/110255
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>