populate attributes when re-writing perf dataandroid13-dev

JoinCallChains, PostUnwindRecords, and MergeMapRecords all flush the
current data to file and start a new data file using MoveRecordFile.
Normally, creating the file fills in the attributes from the event
selection set. However, DoRecording recently added CloseEventFiles
calls which clear the event_fds which are used to populate the attrs.
This change fixes the issue by copying the attrs from the old file.

Test: ran simpleperf on device
$ adb shell
$ cd /data/local/tmp
$ simpleperf record -a --exclude-perf --duration 2 -g \
    -e power:sugov_next_freq -e power:sugov_util_update
$ simpleperf report

Before the fix, all samples would be attributed to the first event type.
With this fix, the samples are correctly attributed.

Bug: 231357972
Change-Id: Id077e3c6f6c4460df595fad04c355717985a914e
(cherry picked from commit 62fe04581f910f5a847ad0653908a3e57b6ed8a2)
Merged-In: Id077e3c6f6c4460df595fad04c355717985a914e

0 files changed, 0 insertions, 0 deletions