Fix local arm unwind to handle dwarf properly.

It turns out that the local unwind for arm only checks the debug_frame
for dwarf information. This means that any arm assembly code that only
has dwarf information cannot be unwound. Fix this so the arm function
calls the dwarf_find_proc_info instead of doing the half implementation
that existed originally.

Bug: 17404548

(cherry picked from commit e5f01b69475e06adb460e999fcb96f7b6cb5cbc0)

Change-Id: I2ce8dad4d7b5aa41aa353faaddc8a031c9f89568