Support symbol dumping for ARMV8 iOS apps.

In my testing, ARM V8 object files and ARM V8 slices of universal binaries do
not contain debug_frame sections (at least at this time), and hence dump_syms
does not output CFI for ARM V8 even in the absence of the "-c" flag.

Patch by:blundell@chromium.org

BUG=542
R=qsr@chromium.org

Review URL: https://breakpad.appspot.com/642002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1222 4c0a9323-5329-0410-9bdc-e9ce6186880e