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Left the default symbol.ARCH value intact and changed stack_core instead
so that it will assume the ABI is arm until it sees an ABI line.  This
allows compatibility for people who are used to pasting portions of a
tombstone instead of the whole thing (assuming said tombstone is arm)
while additionally supporting other architectures if a whole tombstone
  is pasted in.

(cherry picked from commit 15142f79)

Change-Id: Ide73171fc4e513b39bee74e2270252c3b32e23cd