commit a6a04203418f6023b714a5cec6c9f75d1452e841
author Yabin Cui <yabinc@google.com> Mon Jul 23 15:32:47 2018 -0700
committer Yabin Cui <yabinc@google.com> Mon Jul 23 17:50:59 2018 -0700
tree 6e690ef66db3cfd0059b2fc06bb40915ec5e449e
parent 52b5c79cac2c8f6ef51ed9187d8ef3d937ef13bf

simpleperf: use libunwindstack directly for unwinding.

Using BacktraceMap needs to rebuild all maps when some map is
changed. For example, in a system wide recording, about 7% cpu time
in unwinding is used for allocating and freeing map space. By switching
to unwindstack::Maps and update maps when some map is changed, It can
reduce about 10% cpu time in unwinding.

Also set max unwinding frames to 512.
Also remove deprecated unwinding error code.

Bug: 110923759
Test: run simpleperf_unit_test.

Change-Id: I9bd8c54e5087c33de2929768a83e749240ddb203