Support .debug_frame based unwinding in _UPTi_find_unwind_table()

Signed-off-by: Andris Zeila <andris.zeila@accenture.com>
diff --git a/include/libunwind-common.h.in b/include/libunwind-common.h.in
index 228460a..2fb78e8 100644
--- a/include/libunwind-common.h.in
+++ b/include/libunwind-common.h.in
@@ -119,6 +119,8 @@
 /* Each target may define it's own set of flags, but bits 0-15 are
    reserved for general libunwind-use.  */
 #define UNW_PI_FLAG_FIRST_TDEP_BIT	16
+/* The information comes from a .debug_frame section.  */
+#define UNW_PI_FLAG_DEBUG_FRAME	32
 
 typedef struct unw_proc_info
   {