Dump startup and post startup methods for --dump-only

The format is:
hot methods: ...
startup methods: id0, id1, ...
post startup methods: id0, id1, ...
classes:

Also added test.

Test: mm test-art-host-gtest-profile_assistant_test -j32
Bug: 62040831

Change-Id: I2ffbe17e888d4adae348bb14e0b92c284ce1081c