perf symbols: Export symbol_type__is_a
Will be needed by the new HEADER_DSO_INFO feature that will be a HEADER_BUILD_ID superset, replacing it. Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1262629169-22797-2-git-send-email-acme@infradead.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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