simpleperf: handle memfds created by memfd_create.

memfds can be created by ART to store jit code. Map records of them
can override map records of jitted methods. So omit them.

Bug: none
Test: run simpleperf_unit_test.
Test: run simpleperf manually.
Change-Id: Ie800ecfea8f0c0d7de8cee452fb1553c30de22e1
2 files changed