7u40 Request for review: JDK-8011569 ARM: avoid native stack walking

[Joseph Provino]

These are the same changes to 8 that need to be backported to 7u.

webrev is 
here:http://cr.openjdk.java.net/~jprovino/8011569/webrev.7u40.00/ 
<http://cr.openjdk.java.net/%7Ejprovino/8011569/webrev.7u40.00/>

Thanks.

joe