tree c177e6b666f10d9946e5f1f33e727020ac67d186
parent 6e7c4df7cc2374ba72996953c74541b5a0aa7a63
author Christopher Ferris <cferris@google.com> 1519355202 -0800
committer Christopher Ferris <cferris@google.com> 1519358467 -0800

Create maps for libunwind only if they changed.

Increases speed (unwinds per second) by 50%.

Bug: None
Test: manual - took a profile
Test: run simpleperf_unit_test.
Change-Id: I254f70a011c1b3d31bbd4e9e4bb9e85fbf2ffbdf