perf callchain: Separate eh/debug frame offset cache.

Commit f1f13af99a90 ("perf callchain: Cache eh/debug frame offset for
dwarf unwind") introduces a cache for .debug_frame and .eh_frame_hdr.
Unfortunately, it makes them share a same cache (dso->frame_offset).
Which causes unwind failure on ARM:

$ perf test unwind
Test dwarf unwind: FAILED!

The reason is that, if a dso has '.debug_frame' but doesn't have
'.eh_frame_hdr' (like ARM), dso->frame_offset will be filled by offset
of '.debug_frame' during the first time calling of find_proc_info() ->
read_unwind_spec_debug_frame(), and be regarded to '.eh_frame_hdr' when
the second time calling of find_proc_info() ->
read_unwind_spec_eh_frame(), since '.eh_frame_hdr' is checked prior to
'.debug_frame'.

This patch solves the problem by creating two cache fields for
'.eh_frame_hdr' and '.debug_frame'.

Signed-off-by: Wang Nan <[e-mail]>
Acked-by: Jiri Olsa <[e-mail]>
Acked-by: Namhyung Kim <[e-mail]>
Cc: Li Zefan <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/dso.h

···
 		u32		 status_seen;
 		size_t		 file_size;
 		struct list_head open_entry;
-		u64		 frame_offset;
+		u64		 debug_frame_offset;
+		u64		 eh_frame_hdr_offset;
 	} data;
 
 	union { /* Tool specific area */

tools/perf/util/unwind-libunwind.c

···
 				     u64 *fde_count)
 {
 	int ret = -EINVAL, fd;
-	u64 offset = dso->data.frame_offset;
+	u64 offset = dso->data.eh_frame_hdr_offset;
 
 	if (offset == 0) {
 		fd = dso__data_fd(dso, machine);
···
 
 		/* Check the .eh_frame section for unwinding info */
 		offset = elf_section_offset(fd, ".eh_frame_hdr");
-		dso->data.frame_offset = offset;
+		dso->data.eh_frame_hdr_offset = offset;
 	}
 
 	if (offset)
···
 					struct machine *machine, u64 *offset)
 {
 	int fd;
-	u64 ofs = dso->data.frame_offset;
+	u64 ofs = dso->data.debug_frame_offset;
 
 	if (ofs == 0) {
 		fd = dso__data_fd(dso, machine);
···
 
 		/* Check the .debug_frame section for unwinding info */
 		ofs = elf_section_offset(fd, ".debug_frame");
-		dso->data.frame_offset = ofs;
+		dso->data.debug_frame_offset = ofs;
 	}
 
 	*offset = ofs;