simpleperf: fix unwinding libs embedded in apks.

The linker was modified so that a shared library has a read-only
map, then a read-execute map to represent the whole shared library.
It makes simpleperf fail at unwinding libs embedded in apks.

Bug: none
Test: run simpleperf_unit_test
Change-Id: I38933ecdb68482cab2089ae2f3e9559ddae35ce9
4 files changed