Added more functionality to dex file tracking

Additional functions were added for (un)poisoning only certain sections
of a dex file. All functions related to tracking are now in a class
(DexFileTrackingRegistrar) since unpoisoning subsections of an already
poisoned section cause poison reads. Static variables were added
representing specific configurations that were used for testing.

GetCodeItem from art/dex/layout/dex_ir.cc was moved to
art/runtime/dex_file.cc because dex_file_tracking_registrar calls
GetCodeItem and GetCodeItem returns a property of a DexFile.

Bug: 37754950
Test: export ART_DEX_FILE_ACCESS_TRACKING=true && m -j && m -j
SANITIZE_TARGET=address SANITIZE_LITE=true test-art-host

Change-Id: Ie4e5aefb6f80b18fdaae5b5e8aa3bc99d77cbeac