This implements a check that can be done at runtime for the ISA level and
hardware capability. It follows the same implementation as in s390x.

These checks will be important as we enable new instructions and write go
asm implementations using those.

Updates #15403
Fixes #16643

Change-Id: Idfee374a3ffd7cf13a7d8cf0a6c83d247d3bee16
Reviewed-on: https://go-review.googlesource.com/32330Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>