minidump_stackwalk should display r12 in ARM stack traces A=torne@google.com, R=ted, http://code.google.com/p/google-breakpad/issues/detail?id=456
minidump_stackwalk should display r12 in ARM stack traces
A=torne@google.com, R=ted, http://code.google.com/p/google-breakpad/issues/detail?id=456

git-svn-id: 7939527bf0a06ad24ad020f729d5600cb42ed5d7@1151 4c0a9323-5329-0410-9bdc-e9ce6186880e

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