Adds a special case for Marvell Armada 370/XP ARM CPUs

Adds a special case for Marvell Armada 370/XP ARM CPUs

It reports availability of integer division instructions, but these
instructions trigger SIGILL faults.

BUG=https://github.com/dart-lang/sdk/issues/24466
R=regis@google.com

Committed: https://github.com/dart-lang/sdk/commit/ccc7786362a17f3d80a22fe58ccd01e988f274bb

[zra, 2015-10-07 16:38:42]

zra@google.com changed reviewers:
+ regis@google.com

[regis, 2015-10-07 17:12:20]

lgtm

https://codereview.chromium.org/1391313002/diff/1/runtime/vm/cpu_arm.cc
File runtime/vm/cpu_arm.cc (right):

https://codereview.chromium.org/1391313002/diff/1/runtime/vm/cpu_arm.cc#newco...
runtime/vm/cpu_arm.cc:177: } else if (!is_armada_370xp) {
It would be clearer to set the value (again) to false and not rely on the
initialization value:

  } else if (is_armada_370xp) {
    integer_division_supported_ = false;
  } else {
    ...

[zra, 2015-10-07 22:56:14]

Thanks!

https://codereview.chromium.org/1391313002/diff/1/runtime/vm/cpu_arm.cc
File runtime/vm/cpu_arm.cc (right):

https://codereview.chromium.org/1391313002/diff/1/runtime/vm/cpu_arm.cc#newco...
runtime/vm/cpu_arm.cc:177: } else if (!is_armada_370xp) {
On 2015/10/07 17:12:20, regis wrote:
> It would be clearer to set the value (again) to false and not rely on the
> initialization value:
> 
>   } else if (is_armada_370xp) {
>     integer_division_supported_ = false;
>   } else {
>     ...

Done.

[zra, 2015-10-07 22:56:44]

Committed patchset #2 (id:20001) manually as
ccc7786362a17f3d80a22fe58ccd01e988f274bb.